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To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype; My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype; Oracle 10G and later: ALTER TABLE table_name.
The SQL ALTER TABLE command is used to modify the definition (structure) of a table by modifying the definition of its columns. The ALTER command is used
17 Jan 2014
In an earlier lesson, we created a table with the CREATE TABLE command. In this lesson, we will modify the table using the ALTER TABLE command.
The SQL Server (Transact-SQL) ALTER TABLE statement is used to add, modify, or drop columns in a table. Add column in table. You can use the ALTER TABLE statement in SQL Server to add a column to a table. Add multiple columns in table. Modify column in table. Drop column in table. Rename column in table. Rename table.
The 1Keydata SQL Tutorial teaches beginners the building blocks of SQL. For Oracle and MySQL, the SQL syntax for ALTER TABLE Modify Column is,.
In such situation you can use the ALTER TABLE statement to alter or change an existing table by adding, changing, or deleting a column in the table. Consider
ALTER TABLE table_name MODIFY COLUMN column_name datatype; The basic syntax of an ALTER TABLE command to add a NOT NULL constraint to a column in a table is as follows. ALTER TABLE table_name MODIFY column_name datatype NOT NULL; The basic syntax of ALTER TABLE to ADD UNIQUE CONSTRAINT to a table is as follows.
Alter command is a DDL command used for altering the table structure like adding more columns, or changing datatype of any existing column, or to drop aThis SQL tutorial explains how to use the SQL ALTER TABLE statement to add a column, modify a column, drop a column, rename a column or rename a table

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