Postgresql insert empty string. COALESCE(NULLIF(TRIM(col .

• Postgresql insert empty string Understanding ‘NULL’ in PostgreSQL. ALTER TABLE mapdata ALTER COLUMN lat TYPE double precision USING (NULLIF(lat, '')::double precision); The NULLIF will return NULL if the lat column is an empty string, otherwise it'll return the lat column value. the problem is that when we insert empty strings in a field of type numeric, May 22, 2020 · There is ,a as parameter to string_to_array() which gives me array with an empty string and a, but there I do not know how to escape colons which can be in input values. From the preceding discussion, it’s evident that when migrating from Oracle to PostgreSQL, empty string handling is important and crucial. Therefore, using the default settings, a NULL is written as an unquoted empty string, while an empty string is written with double quotes (""). SELECT * FROM schema. Returns target with new_value inserted. If you are using satori/go. Dec 19, 2017 · NULLIF will replace col with NULL if it finds an empty string. Inserting NULL Values. 1-901. Otherwise, you should be able to load the CSV data directly from psql: I run a Postgres database and would like to convert empty string into NULL. 2. It’s primarily used when you need to handle different types that don’t match up naturally, such as converting a text string to a numeric type. You don't need to use a different SQL statement for each case, you just need to tweak the statement so that it won't fail when an empty string is passed: May 4, 2023 · This function will convert empty string to NULL. And COALESCE will replace the NULL with 'blank'. 하지만 PostgreSQL 에서는 '' 은 널이 절대 아닙니다. INSERT INTO originators(originator, id, regexp) VALUES ('null', 1, -1); This is the table design: See full list on enterprisedb. WHERE AND Operator OR Operator LIMIT FETCH IN BETWEEN LIKE In this article, we will explore how to insert ‘NULL’ values into a PostgreSQL database using Python. The query would look like the below. To insert NULL values into a PostgreSQL table, you can simply specify NULL in your INSERT statement. update(). COALESCE(NULLIF(TRIM(col Nov 8, 2024 · Here, the excerpt column in Post 2 shows content from the body since COALESCE treats both NULL and empty strings as missing values. incentive_marketing = ''; UPDATE pt. So either of these works: May 23, 2022 · Handling empty strings in PostgreSQL. In the above query SELECT '' FROM dual returns empty string in postgres. So, specify None for the records which you wish to insert as NULL values as shown below. The first thing to do before a database can be of much use is to insert data. I would like to know if it is possible to insert a 'null' string in a column which has a NOT NULL constraint. table NULLIF(columnnam Jun 19, 2018 · The value in the column is a string 'null' not the database type null which looks like <null> in the database manager. To prevent this, you can replace NULL with empty String while concatenating. SQL Statement Explained. I do check if the value in file is empty or null then set it to java null. As per the PostgreSQL, I do have unquoted empty string. 什么是空字符串和 null 值？ Jun 6, 2018 · Ok, after more digging I have found out, that problem is in empty string - null works as expected. I thought it should insert database type null for None (see this question). Oct 15, 2024 · With the PostgreSQL INSERT INTO clause, we can specify the table and the corresponding columns to which the data will be added. . Insert Into. By understanding the PostgreSQL INSERT syntax, users can easily manage data entry tasks. 0. Conceptually, NULL means "a missing unknown value" and it is treated somewhat differently from other values. Or omit the column completely from your INSERT statement. sizes = Column(postgresql. This is why we need to Jan 19, 2023 · As we all know, we can insert both null and non-null values into a PostgreSQL table. format This section describes functions and operators for examining and manipulating string values. These values are not to be null but instead always an empty string. Now, you need to convert this to "date-time" type, for this you can use " to_date() " function or just typecast it. Oct 15, 2002 · > TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org In response to how do i insert an empty string ? at 2002-10-15 10:01:47 from Peter Galbavy Aug 31, 2010 · I need your help please. To insert data into a table in PostgreSQL, we use the INSERT INTO statement. at 2016-02-14 18:21:43 from Thomas Kellerer Re: PostgreSQL: Inserting NULL values adds empty string. jdbc4 Application Server: apache-tomcat-6. 4. I'm using PostgreSQL, although this probably applies to other database management systems as well. Aug 10, 2015 · I removed some stuff of the sql that was not required. Everything is working fine on few other configurations or when history is empty string. CREATE table IF NOT EXISTS (other cols, some_date DATE, other cols); When I extract the json object from the API, there might actually be an empty string '' instead of a empty cell. Sep 9, 2019 · Using the ‘INSERT’ command to add data to a PostgreSQL table Avoid inserting string data enclosed in double-quotation marks. 먼저 오라클에서의 결과를 살펴보겠습니다. It is different from an empty string or zero, as it represents the absence of any value Aug 1, 2017 · To insert null values to the database you have two options: omit that field from your INSERT statement, or; use None; Also: To guard against SQL-injection you should not use normal string interpolation for your queries. &nbsp;Default Values # A column can be assigned a default value. Its purpose is to display the first non-null value it encounters. When inserting data, you should be aware of how NULL values interact with various data types and constraints. Of course you can also insert more than one row, but there is no way to insert less than one row. com Oct 7, 2024 · Often in PostgreSQL you may want to convert empty strings to Null values. Let’s create a sample table and insert data to it. PostgreSQL Quick Start. Mar 29, 2011 · Assume this schema (looks best with fixed width font): # \d service_bills Table "public. To ensure the same behavior, you can add a check constraint: Jul 8, 2024 · In PostgreSQL, the NOT NULL constraint is a fundamental feature to ensure that a column cannot contain NULL values. When a string contains special characters or reserved keywords, using single quotes helps PostgreSQL understand that the content between the quotes is a literal string and not a part of the SQL syntax. ), SQL Server inserts 0, if you insert an empty string to a decimal column (DECIMAL i. My recommendation is that you make the decision based on what the meaning of a missing or empty string is: if you want to express "I know that this value is empty", then use the empty string Mar 1, 2022 · I have a table definition in Postgres that use now() for timestamp and current_user() for auditing. In this discussion, we’ll primarily explore coalesce usage in PostgreSQL. The CAST function in PostgreSQL is a standard SQL method to convert one data type into another. Reading values follows similar rules. at 2016-02-15 11:53:05 from Inoue, Hiroshi Browse pgsql-odbc by date Mar 11, 2002 · You're trying to insert into a timestamp. at 2016-02-14 16:48:47 from Adrian Klaver Re: PostgreSQL: Inserting NULL values adds empty string. However, an empty string is a valid value and the database expects a matching row in the Nov 18, 2014 · Need to insert null value to field with uuid type without NOT NULL specification (not primary key). In SQL Server, when you concatenate a NULL String with another non-null String the result is NULL, which means you lose the information you already have. You need to concatenate the time with the date. Strings … Aug 13, 2019 · PostgreSQL does not treat empty string as NULL This could bring some code issue when migrating Oracle database to PostgreSQL. When you specify NULL in your list of values to insert, Postgres will try to insert a NULL into that column of the table. What should be inserted into a json column for an empty json value for best practice? Feb 14, 2023 · In cases where PostgreSQL cannot guess the data type from context, you had better use an explicit type cast: WITH date_data (some_date) AS ( VALUES (CAST(null AS date)) ) INSERT INTO null_date (some_date) SELECT some_date FROM date_data; PostgreSQL used to behave differently in cases like this, but commit 1e7c4bb0049 changed that in 2017. Database logging was little bit confusing though. 4. To create a new row, use the INSERT command A NULL is output as the NULL string and is not quoted, while a data value matching the NULL string is quoted. Depending on your use case it might be also interesting to take a look at GENERATATED COLUMNS . However, empty strings can still appear as blanks. COALESCE(NULLIF(col,''), 'blank') This will handle an empty string and a string with spaces. Sometimes, a field is null (as expected). We often refer to NULLs as representing missing values. I have a column that: NOT NULL However when I want to insert a row with an empty string as like: '' it doesn't give me an error and accepts. Quick solution: INSERT INTO "table_name" ("column1", "column2", "column3", "columnN") VALUES (value1, NULL, NULL, valueN); Nov 26, 2021 · Kindly help to convert empty string to null in postgres. Sep 1, 2019 · I want to know if there's something other than checking the date part and giving different insert statements. Oct 16, 2017 · NULL is not the same as "default". 4 postgreSQL server. May 22, 2019 · This might be impossible but I was wondering if someone more experienced knew if this is possible to do in postgresql. As it shows same output for null and for empty string input: empty string: Feb 20, 2025 · Specifies the string that represents a null value. SELECT 1 FROM DUAL WHERE ( SELECT '' FROM dual) IS NULL. Jul 25, 2018 · When you say "blank", do you mean NULL, or an empty string? Because for a field of type TIMESTAMP, the first should work (if the field is nullable), but the second won't. If the item designated by the path is an array element, new_value will be inserted before that item if insert_after is false (which is the default), or after it if insert_after is true. If there is a constraint which prevents that from happening, such as a NOT NULL specifier on the column, the insert will fail. How can I insert a string date in the right for Apr 3, 2014 · No, you can't do so directly. Jul 10, 2018 · When using the \\copy command with psql I have a file with empty values. 1 JDBC Driver: postgresql-9. All of these are folded to n spaces in char(n) per definition of the type. In the insert, I am selecting the id of the table abc so that is why I am using table abc. csv May 18, 2010 · I have a Perl script inserting data into Postgres according to a pipe delimited text file. From the Postgres documentation:. In this article, we would like to show you how to insert NULL values to the table in PostgreSQL. Data is conceptually inserted one row at a time. What is PostgreSQL? PostgreSQL Sample Database Install PostgreSQL on Windows Connect to Database Load Sample Database Install PostgreSQL on macOS Install PostgreSQL on Linux Querying Data. To convert a column into text, you can use column_name::TEXT or CAST(column_name AS TEXT). 空文字の扱い. Are you running this query manually, or getting the input from somewhere (that might be sending empty string)? – Oct 26, 2016 · You could also use a *string in your code to the same effect. if you need this you can use a trigger or manage te conversion in Insert or Update phaseanyway the function is NULLIF() – ScaisEdge Jul 13, 2015 · The only other option, which is NOT what I would recommend, is to change the datatype to varchar so you can insert an empty string. In this article, We will cover how to insert data into a PostgreSQL table and explain examples like inserting single and multiple (But you can cast a string literal, too. postgresql insert null value on query. TEXT), server_default="{}") and let it do the implicit conversion, as mentioned in @Hett comment above – May 28, 2011 · However, you could write a simple function to convert empty strings to NULL and use that in your INSERT: create function macaddr_ify(m varchar) returns macaddr as $$ begin if m is null or length(m) = 0 then return null; end if; return cast(m as macaddr); end; $$ language plpgsql; Oct 10, 2013 · I am using postgreSQL. Use NULL: insert into main_device (ntypapp, no_main, lib_main, nopol, no_chrono) values (1, 1, 'TST LASER', NULL, 1578); A NULL value does not need to match the foreign key constraint (in this context, NULL means "no value"). Just update the columns and fix your schema. ). Jun 15, 2018 · I have a column that requires a timestamp with time zone but I cannot use a built in pgSQL function nor can I modify the column to accept null dates. Time `json:"updated Oct 26, 2015 · also you shall be able to execute this statement INSERT INTO example(arr) VALUES (ARRAY[1,2,3]) (as another alternative to use if you don't have a string value) – Victor Commented May 29, 2018 at 18:23 我们将解释为什么插入空值会导致错误，并提供示例说明。 阅读更多：PostgreSQL 教程 PostgreSQL 插入空值的原因 在 PostgreSQL 中，插入空值可能会引发错误，这是因为数据库表中的某些列定义为不允许包含空值。如果我们尝试将空值插入这些列中，Postg Jul 24, 2019 · When a double-quoted string is used and that string is read as the field value, then the field value is automatically converted to an SQL NULL value. This will handle an empty string. In PostgreSQL, ‘NULL’ is a special marker that indicates the absence of a value or an undefined state. In Oracle, inserting an empty string into a NOT NULL column will trigger a rejection because it’s treated as null. I guess problem is in PostgreSQL JDBC driver, is there some sensible reason to treat null string as a bytea value? Mar 11, 2021 · If you want the empty strings to be replaced even if you don't say so in your SELECT, you might want to write a TRIGGER on INSERT or UPDATE to keep the jsonb column clean for future selects. My Feb 20, 2025 · 9. elms=> create table test ( col1 varchar(10), col2 varchar(10) ); CREATE TABLE testdb=> insert into test values ( '',null); INSERT 0 1 testdb=> select count(*) from test where col1 is null; count ------- 0 (1 row) testdb Sep 23, 2013 · The types of values need to be consistent; coalescing the empty string to a 0 means that you cannot then compare it to null in the nullif. You might prefer an empty string even in text format for cases where you don't want to distinguish nulls from empty strings. 在本文中，我们将介绍 PostgreSQL 数据库中的默认值 NULL 和空字符串的概念，以及它们在数据库中的应用和区别。我们将探讨它们在表设计和数据插入中的用法，并举例说明它们的区别和实际应用场景。 阅读更多：PostgreSQL Jan 4, 2011 · In fact, I just tried to ALTER a table to change from NULL as default to empty string as default, and 1) it complained the there were NULL values there so I had to manually update to empty strings and 2) that triggered the "Avoid assigning strings of zero length to character-type variables" warning in Toad. ARRAY(postgresql. Jan 4, 2024 · Understanding CAST in PostgreSQL. You can disable this behavior with pg:",use_zero"tag. Summary: Feb 22, 2017 · There are 9 characters in your pattern. ), the statement fails. incentive_marketing = NULL WHERE pt. My command: \\copy agltransact FROM 'dbo_agltransact. Dec 15, 2014 · If you're using 0 and an empty string '' and null to designate undefined you've got a data problem. g. But I don´t know how to avoid values if they are NULL, and if NULL I want to put an empty string, like ''. There is no "empty string" for the type integer. Because a CHAR() value has a fixed length, an empty string ('') is padded with spaces to the full length. By default all columns except primary keys are nullable and go-pg marshals Go zero values (empty string, 0, zero time, nil map, and nil slice) as SQL NULL. SELECT 1 FROM DUAL WHERE ( SELECT '' FROM dual) IS NULL In the above query SELECT '' FROM dual returns empty string in postgres. Quick solution: SELECT * FROM "table_name" WHERE "column_name" = ''; Apr 27, 2022 · The package you are using is not specified in the question. Mar 5, 2020 · The other usage of NULL is to represent an empty string and empty numeric value. The syntax is straightforward: SELECT CAST(expression AS target_type); Jan 6, 2024 · To insert data into our newly created table, you’ll typically use the following PostgreSQL INSERT command: INSERT INTO my_table (data, numbers) VALUES ('{item1,item2,item3}', '{1,2,3}'); Array literals in PostgreSQL are entered using curly braces {} and separated by commas. When you insert string data into a PostgreSQL table, avoid using double quotes to enclose the data. This option is not allowed when using binary format. You can use the following SQL statements to create a table and insert data in both Oracle and PostgreSQL: Sep 7, 2012 · In old versions or if you still run with standard_conforming_strings = off or, generally, if you prepend your string with E to declare Posix escape string syntax, you can also escape with the backslash \: PostgreSQL 数据库中的默认值NULL和空字符串. > The same insert is adding NULL values into database when linux odbc driver is used to connect to linux database. e. So in my case it is enough to deal with empty strings where necessary on my side before using repository. However, Perl makes this field into an empty string and the Po Feb 20, 2025 · jsonb_insert ( target jsonb, path text[], new_value jsonb [, insert_after boolean] ) → jsonb. Jan 28, 2022 · Inserting NULL values using SQLAlchemy in PostgreSQL. 4 odbc driver to talk to 9. These fields would also need to contain unique values, so I am May 6, 2021 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Aug 26, 2017 · I assume you are aware that numeric data types have no concept of "empty string" ('') . Specifies the string that represents a null value. May 7, 2021 · 这里可以看出，插入数据库后，空字符串被当做NULL处理了。也就是说空字符串(empty string)在数据库中是不能存储的。 而只有单个空格的字符串是不会被转成NULL的。因为它并不是空字符串(empty string) postgresql中的NULLs和空字符串(empty string) 使用相同的表结构 In this article, we would like to show you how to find rows where the column value is an empty string in PostgreSQL. Looks like you're missing --with 'null if "NULL"' in your command. This will be a lot more efficient than to first change the source data. The following snipped should do this with all columns, but it isn't working. However, in many cases, we don’t want those null values. empty string 그 자체를 의미합니다. Valid input for the time stamp types consists of a concatenation of a date and a time, followed by an optional time zone, followed by an optional AD or BC. REPLACE function will not find an empty string, so this is the only way. Fixing noisy neighbor problems on AWS RDS is hard—Neon makes it easier with its project-per-customer model In Oracle, if you insert an empty string ('') to a NUMBER column, Oracle inserts NULL. Using NULLIF with COALESCE for Improved Handling. Looks like you exported from a string data type like text and had some actual empty string in there - which are now represented as "" - " being the default QUOTE character in CSV format. Both parameters must be of compatible type, so sanitize your input in PHP. I am reading rows from a file and inserting the values into a table. Jul 31, 2020 · An empty string is not NULL. The above SQL statement created an empty table with three fields: brand, model, and year. while concatenating String. CREATE DATABASE test; \\c test; CREATE TABLE test ( id numeric(3,0) PRIMAR This tutorial shows you how to use the PostgreSQL INSERT statement to insert a new row into a table and return the last inserted id. I'm doubtful that's the "only other option". Example 2: In this example there are three students: Alice has 90 marks, Bob has 0 marks, and Davis does not have marks yet. Numeric 0 has significance so it cannot be used to represent the empty numeric filed, the unknown value at a certain time. I've tried where timestamp = NULL , 'EPOCH' (which you would think would be the default value), a valid timestamp of zeros ( 0000-00-00 00:00:00-00 , which results in a out of range error), the lowest date possible according to the docs ( January 1, 4713 BC ) and a blank Mar 26, 2022 · An empty string needs slightly more storage than a NULL value, but that should not be the deciding factor. 2. Time `json:"created_at" gorm:"column:created_at"` UpdatedAt time. Even if you know only some column values, a complete row must be created. I have a column in my create statement. uuid, you can use the NullUUID type:. When creating fields in a table we have to specify the data type of each field. incentive_advertising = NULL WHERE pt. Aug 4, 2008 · The warning is issued since you are using backslashes in your strings. The problem in either case is in mapping to/from a nullable string to a non-nullable string. In SQL Server, if you insert an empty string ('') to an integer column (INT i. Oct 15, 2002 · > TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org In response to how do i insert an empty string ? at 2002-10-15 10:01:47 from Peter Galbavy. Let us use the same insert() and values() function to insert NULL values. This is not the case. : Sep 21, 2024 · Empty string and NOT NULL constraint. In char(n) an empty string is not different from any other string consisting of only spaces. When a new row is created and no values … Jun 4, 2015 · When you want to insert an array into a postgreSQL DB via SQL you do it like this: INSERT INTO tablename VALUES ('{value1,value2,value3}'); ATTENTION: You need the single quotes to surround the curly braces! So actually you're passing a String/Varchar of a special "array" grammar to the DB Dec 29, 2021 · PostgreSQL don't cast automatically an empty string in null as oracle . If you did not define a column default, you can also just omit the column in the INSERT command and it will be filled with NULL (which is the default DEFAULT). Setting Up Environment PostgreSQL 如何将空字符串设为 null 值以允许可选字段中存在重复的空字符串 在本文中，我们将介绍如何在 PostgreSQL 数据库中将空字符串设为 null 值，以允许可选字段中存在重复的空字符串。 阅读更多：PostgreSQL 教程 1. It follows logically that the above expressions work for char(n) as well - just as much as these (which wouldn't work for other character types): Oct 3, 2024 · We often need to replace NULL values with empty String or blank in SQL e. You should pass two (2) arguments to execute(), e. This query might help: Feb 8, 2024 · When a sequence of characters is enclosed within single quotes, PostgreSQL interprets it as a string literal. 28. Coalesce in PostgreSQL When I run my PHP import script (below), the import fails because the empty string is not in the date format. For insert queries you can also specify a default value for a column using pg:"default:now()" tag. This could bring some code issue when migrating Oracle database to PostgreSQL. Unfortunately, there is a mix between null value and ” (empty) in the excerpt column. Sep 7, 2020 · type Dividend struct { symbol string `json:"symbol"` dateex string `json:"dateex"` datedec string `json:"datedec"` amount string `json:"amount"` curr string `json:"curr"` freq string `json:"freq"` } The problem I'm having is how to insert either an empty string or null, into the database as NULL. Feb 4, 2022 · Execute the below statements to create database and create table then insert null ,empty string and space and string x. type Asdf struct { ID uint64 `json:"id" gorm:"type:uuid;column:id"` Name string `json:"name" gorm:"column:name"` NullableKey uuid. It's either a number or NULL (or 'NaN' for numeric - but not for integer et al. Feb 20, 2025 · 5. Oracleでは自動的に空文字（""）を nullに変換しますが、PostgreSQLではnullに変換しません。 つまり、PostgreSQLでは空文字（""）とnullは別の値として扱われます。 Jul 27, 2015 · Second way is to handle the empty strings while converting. Same statement executed from pgAdmin works fine. Aug 13, 2019 · PostgreSQL does not treat empty string as NULL. Feb 14, 2016 · > I am using PostgreSQL 9. Mar 20, 2015 · If you have a variable and when that variable is empty you want to insert a NULL value you can use NULLIF with the variable enclosed in single quotes to prepare for that (this is somewhat dirty solution as you have to treat the variable as an empty string and then convert it to integer): Feb 14, 2016 · Re: [ODBC] PostgreSQL: Inserting NULL values adds empty string. NULL represents unknown or missing information in databases, distinct from an empty string or the number zero. UPDATE pt. You can use the NULLIF () function with the following syntax to do so: NULLIF(team, '') AS team, points. That’s where coalesce comes in. In python NULL equivalent is None. incentive_channel Mar 25, 2025 · It is important to differentiate between NULL and an empty string or zero, as they convey different meanings. The default is \N (backslash-N) in text format, and an unquoted empty string in CSV format. service_bills" Column | Type | Modifiers Oct 24, 2023 · To replace NULL values with an empty string, use COALESCE(column_name, ''). incentive_channel SET pt. Dec 20, 2019 · I´m trying to create an insert statement with my database values, to send to my app. When I try insert '', this return: ERROR: invalid input syntax for uuid: "" When I try insert Mar 4, 2012 · I am using PostgreSQL and would like to prevent certain required CHARACTER VARYING (VARCHAR) fields from allowing empty string inputs. date_created date NULL DEFAULT now(), edited_by varchar NULL DEFAULT "current_user"(), Nov 21, 2011 · DB: PostgreSQL 8. but in oracle it is returning as null. Is there any solution to use prepared statement with IN clause to search for empty string values? When I look at the data in pgAdmin the field is empty and shows no value. The empty string is technically a value, so you will almost always have to do something like this if you decide empty string should be translated to nil: Jun 6, 2024 · Further, NULL can be assigned to a column of any data type, whereas empty strings only apply to string columns and cannot be used for other data types, such as numeric. SELECT Column Aliases ORDER BY SELECT DISTINCT Filtering Data. HI Team, Kindly help to convert empty string to null in postgres. ) Numeric data types (integer, numeric, double precision, ) cannot store empty strings (''), only string types (text, varchar, ) can. 이제 메인 주제로 넘어가겠습니다. If you want to avoid the message, type this command "set standard_conforming_strings=on;". Dec 30, 2010 · The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same as an empty string '', or a value of zero. I'm not sure what "empty value" means, but either all spaces or NULL seems reasonable. To pass a null value, use the key word null. You'll need to know the column name and do this for each column name. Then use "E" before your string including backslashes that you want postgresql to intrepret. 1. The following SQL statement will insert one row of data into the cars table you created in the previous chapter. > I see that when inserting NULL values into DB is adding empty string in the database only in windows. We have a PHP application running on MySQL, and we need to use PostgreSQL for a new customer. &nbsp;String Functions and Operators # 9. NullUUID `json:"key" gorm:"column:key"` CreatedAt time. The only valid ways to specify a default value are: To omit the column from an INSERT column-list; or; To explicitly specify the keyword DEFAULT for a column in an INSERT or UPDATE. ERROR: insert or update on table "prop_info" violates foreign key constraint "prop_info_prop_name_fkey" Detail: Key (prop_name)=() is not present in table "desp". The example replaces the empty string '' with NULL. FROM athletes; This particular example will convert all empty strings in the team column of the athletes table to null values. In PostgreSQL, however, the insert will succeed because empty strings are distinct from null. Read Jan 8, 2016 · Just as a note for anyone trying to create a default value via SqlAlchemy (for python): you have to use {} for default value in the ORM mapping, e. However, an empty string can also indicate the absence of data. gijo tjhkfb sjkgnr yvtmz rnuhsnnz mzgesj kxno yuff mkjkhl uvyw nhrla tei yfqxo dqq aofyyd