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Learn how to use the ALTER TABLE statement to add, delete, or modify columns in an existing table. See syntax, examples, and data types for SQL Server, MySQL, and Oracle.
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Modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers. The syntax for ALTER TABLE is different for disk-based tables and memory-optimized tables.
ALTER TABLE Syntax. The syntax of the SQL ALTER TABLE statement is: ALTER TABLE table_name clause supporting_codes; Here, table_name is the name of the table to be modified; clause gives further information on how the table is to be altered like ADD, RENAME COLUMN, etc. supporting_codes are the codes supporting the clause
Learn how to use the SQL ALTER TABLE statement to change the structure of existing tables in the database. See the syntax and examples of adding, modifying, and dropping columns using the ADD, MODIFY, and DROP clauses.
This 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 (with lots of clear, concise examples). We've also added some practice exercises that you can try for yourself.
The basic syntax for SQL ALTER TABLE is as follows: ALTER TABLE table_name ADD column_name data_type [column_constraint], MODIFY column_name data_type [column_constraint], DROP column_name; Here, The table_name is the name of the table you want to modify.
This SQL Server tutorial explains how to use the ALTER TABLE statement in SQL Server (Transact-SQL) to add a column, modify a column, drop a column, rename a column or rename a table with syntax and examples.