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  1. W3School
    https://www.w3schools.com/SQl/sql_alter.asp

    SQL ALTER TABLE Statement - W3Schools

    • The ALTER TABLEstatement is used to add, delete, or modify columns in an existing table. The ALTER TABLEstatement is also used to add and drop various constraints on an existing table.… See more

    Alter Table - Drop Column

    To delete a column in a table, use the following syntax (notice that some database systems don't … See more

    W3School
    Alter Table - Alter/Modify Datatype

    To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: My SQL / Oracle (prior version 10G): Oracle 10G and later: See more

    W3School
    SQL Alter Table Example

    Look at the "Persons" table: Now we want to add a column named "DateOfBirth" in the "Persons" table. We use the following SQL statement: Notice that the new column, "DateOfBirt… See more

    W3School
    Change Data Type Example

    Now we want to change the data type of the column named "DateOfBirth" in the "Persons" table. We use the following SQL statement: Notice that the "DateOfBirth" column is n… See more

    W3School
    Drop Column Example

    Next, we want to delete the column named "DateOfBirth" in the "Persons" table. We use the following SQL statement: The "Persons" table will now look like this: See more

    W3School
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    Table of Contents
    Alter Table - Drop Column
    Alter Table - Alter/Modify Datatype
    SQL Alter Table Example
    Change Data Type Example
    Drop Column Example
    How to change the data type of a column in a table?
     

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    Changing the data type of a column in an SQL database is a common task that can be accomplished using the ALTER TABLE statement. This operation is essential when you need to adjust the data types to better suit the data you are storing or to comply with changes in the data model.

    SQL Code Example

    To change the data type of a column, you can use the ALTER TABLE statement with the ALTER COLUMN clause. The syntax varies slightly depending on the SQL database you are using, but the general approach is similar across different systems.

    Here's an example of how to change a column's data type in SQL Server:

    ALTER TABLE TableName
    ALTER COLUMN ColumnName NewDataType;

    For instance, if you want to change the varchar(50) data type of a column named ColumnName to nvarchar(200), you would use the following SQL command:

    ALTER TABLE TableName
    ALTER COLUMN ColumnName NVARCHAR(200);
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  3. Stack Overflow
    https://stackoverflow.com/questions/626899

    How do you change the datatype of a column in T-SQL Server?

    Altering user-defined table types in SQL ServerJul 9, 2012
    sql - Modifying a column type with data, without deleting the data ...May 17, 2012
    Change column datatype in SELECT in SQL Server
    See more results
     
  4. SQL Shack
    https://www.sqlshack.com/sql-queries-to-c…

    SQL queries to change the column type - SQL Shack

    WEBSep 22, 2021 · This article covers the different SQL queries to change the column type. We are going to learn how we can change the data type of the columns of the following databases: We can use ALTER TABLE ALTER …

  5. Microsoft Learn
    https://learn.microsoft.com/en-us/sql/t-sql...

    ALTER TABLE (Transact-SQL) - SQL Server | Microsoft Learn

  6. SQL Server Tutorial
    https://www.sqlservertutorial.net/sql-server...

    SQL Server ALTER TABLE ALTER COLUMN - SQL Server Tutorial

  7. TutorialsTeacher.com
    https://www.tutorialsteacher.com/sql/sql-modify-column-datatype-size

    SQL - Modify Column Data Type and Size - TutorialsTeacher.com

  8. Baeldung
    https://www.baeldung.com/sql/alter-column-datatype

    Change the Data Type of a Column in SQL - Baeldung

  9. Database.Guide
    https://database.guide/how-to-change-a-columns...

    How to Change a Column’s Data Type in SQL Server (T-SQL)

  10. Programiz
    https://www.programiz.com/sql/alter-table

    SQL ALTER TABLE Statement (With Examples) - Programiz

  11. W3School
    https://www.w3schools.com/sql/sql_datatypes.asp

    SQL Data Types for MySQL, SQL Server, and MS Access

  12. LearnSQL.com
    https://learnsql.com/blog/data-type-creating-table

    How to Choose Data Types for SQL Table Columns

  13. SQL Server Tips
    https://www.mssqltips.com/sqlservertip/6114/how-to...

    How to Alter User Defined Table Type in SQL Server

  14. PostgreSQL Tutorial
    https://www.postgresqltutorial.com/postgresql...

    PostgreSQL Change Column Type - PostgreSQL Tutorial

  15. Snowflake Documentation
    https://docs.snowflake.com/en/sql-reference/sql/alter-table-column

    ALTER TABLE … ALTER COLUMN | Snowflake Documentation

  16. Microsoft Learn
    https://learn.microsoft.com/en-us/sql/t-sql/data-types

    Data types (Transact-SQL) - SQL Server | Microsoft Learn

  17. Microsoft Learn
    https://learn.microsoft.com/en-us/sql/t-sql...

    CREATE TYPE (Transact-SQL) - SQL Server | Microsoft Learn

  18. Database Administrators Stack Exchange
    https://dba.stackexchange.com/questions/82233

    Update datatype of primary key without deleting the table

    sql server - Easy way to change Column ID (primary key) of ...
    How to change VARCHAR length in PRIMARY KEY in SQL Server ...
    sql server - Changing identity column from INT to BIGINT ...
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  19. W3School
    https://www.w3schools.com/SQL/sql_update.asp

    SQL UPDATE Statement - W3Schools

  20. Stack Overflow
    https://stackoverflow.com/questions/11035295

    SQL Server Management Studio - how to change a field type …

  21. Stack Overflow
    https://stackoverflow.com/questions/67769181

    Change the datatype of a column in delta table - Stack Overflow

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