Αποτελέσματα Αναζήτησης
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. ALTER TABLE - ADD Column
Summary: in this tutorial, you will learn how to use the SQL Server ALTER TABLE ALTER COLUMN statement to modify a column of a table. SQL Server allows you to perform the following changes to an existing column of a table: Modify the data type. Change the size. Add a NOT NULL constraint.
In SQL, the ALTER TABLE command is used to modify the structure of an existing table. In this tutorial, you will learn about the SQL ALTER TABLE statement with the help of examples.
ALTER TABLE Statement. 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.
Description. The SQL ALTER TABLE statement is used to add, modify, or drop/delete columns in a table. The SQL ALTER TABLE statement is also used to rename a table. Add column in table. Syntax. To add a column in a table, the ALTER TABLE syntax in SQL is: ALTER TABLE table_name. ADD column_name column_definition; Example.
ALTER TABLE 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.
A SQL Server example for changing, adding, and removing columns for an existing table
