What is the command to ALTER TABLE in SQL?

Question

ALTER TABLE table_name ADD column_name datatype; The basic syntax of an ALTER TABLE command to DROP COLUMN in an existing table is as follows. ALTER TABLE table_name DROP COLUMN column_name; The basic syntax of an ALTER TABLE command to change the DATA TYPE of a column in a table is as follows.

How do you alter a table in SQL?

To change the data type of a column in a table, use the following syntax:1SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype;2My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype;3Oracle 10G and later: ALTER TABLE table_name.

How do you alter a data table?

How to Edit Data Table Properties1Select Edit > Data Table Properties.2Click on the data table to use in the Data tables list. Comment: New data tables are added by selecting File > Add Data Tables....3Click on the Set as Default button to the right of the Data tables list.4Click OK.

What is use of alter query?

alter command is used for altering the table structure, such as, to add a column to existing table. to rename any existing column. to change datatype of any column or to modify its size. to drop a column from the table.

What are the options in ALTER TABLE command?

ALTER TABLE changes the structure of a table. For example, you can add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. You can also change characteristics such as the storage engine used for the table or the table comment.

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