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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. To add a column in a table, use the following syntax: ALTER TABLE table_name. ADD column_name datatype;
Use MySQL ADD COLUMN clause in the ALTER TABLE statement to add one or more columns to a table.
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.
24 sty 2014 · To add a column at a specific position within a table row, use FIRST or AFTER col_name. The default is to add the column last. You can also use FIRST and AFTER in CHANGE or MODIFY operations to reorder columns within a table. http://dev.mysql.com/doc/refman/5.1/en/alter-table.html.
In this tutorial, you have learned how to use the MySQL ALTER TABLE statement to add a column, modify a column, rename a column, drop a column, and rename a table.
MySQL allows us to add a column to an existing table using the MySQL ALTER TABLE ADD COLUMN statement. You can also add more than one column to a table using the MySQL ADD COLUMN statement.
To add a new column to a table, you use the following syntax. Syntax: ALTER TABLE table_name . ADD new_column_name column_definition . [ FIRST | AFTER column_name ]; In this syntax, First, you specify the name of the in which you want to add the new column after the ALTER TABLE statement.
