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This tutorial shows you how to use the Oracle ALTER TABLE ADD column statement to add one or more columns to an existing table.
- Alter Table
Oracle ALTER TABLE ADD Column By Examples. This tutorial...
- Alter Table
This Oracle tutorial explains how to use the Oracle ALTER TABLE statement to add a column, modify a column, drop a column, rename a column or rename a table (with syntax, examples and practice exercises).
Use the ALTER TABLE statement to alter the definition of a nonpartitioned table, a partitioned table, a table partition, or a table subpartition. For object tables or relational tables with object columns, use ALTER TABLE to convert the table to the latest definition of its referenced type after the type has been altered.
The ALTER TABLE statement allows you to: add a column to a table. add a constraint to a table. drop a column from a table. drop an existing constraint from a table. increase the width of a VARCHAR or VARCHAR FOR BIT DATA column. override row-level locking for the table (or drop the override)
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;
22 Μαρ 2011 · ALTER TABLE my_tab ADD (col_3 NUMBER(10)); ALTER TABLE my_tab MODIFY ( col_1 invisible, col_2 invisible ); ALTER TABLE my_tab MODIFY ( col_1 visible, col_2 visible ); Now col_3 would be displayed first in a SELECT * FROM my_tab statement.
Oracle ALTER TABLE ADD Column By Examples. This tutorial shows you how to use Oracle ALTER TABLE statement to alter table structure e.g., add, modify, rename or remove columns and rename a table.
