This Oracle tutorial explains how to use the OracleALTER TABLE statementto add a column, modify a column, drop a column, rename a column or rename a table (with syntax, examples and practice exercises). Description The Oracle ALTER TABLE statement is used to add, modify, or drop/delete col...
MultipleADD,ALTER,DROP, andCHANGEclauses are permitted in a singleALTER TABLEstatement, separated by commas. This is a MySQL extension to standard SQL, which permits only one of each clause perALTER TABLEstatement. For example, to drop multiple columns in a single statement, do this: ALTER TA...
The syntax for thecolumn-definitionfor a new column is almost the same as for a column in a CREATE TABLE statement. This syntax allows a column constraint to be placed on the new column within the ALTER TABLE ADD COLUMN statement. However, a column with a NOT NULL constraint can be added...
TheALTER TABLEstatement 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: ALTERTABLEtable_name ADDcolumn_name datatype; The following SQL adds an "Email" column to the "Customers" table:...
ALTER TABLE table_name DROP COLUMN column_name; For Example: ALTER TABLE supplier DROP COLUMN supplier_name; This will drop the column calledsupplier_namefrom the table calledsupplier. Rename column(s) in a table (NEW in Oracle 9i Release 2) ...
Table Optionstable_options signifies table options of the kind that can be used in the CREATE TABLE statement, such as ENGINE, AUTO_INCREMENT, AVG_ROW_LENGTH, MAX_ROWS, ROW_FORMAT, or TABLESPACE. For descriptions of all table options, see Section 13.1.18, “CREATE TABLE Statement”. ...
SQL: ALTER TABLE Statement The ALTER TABLE statement allows you to rename an existing table. It can also be used to add, modify, or drop a column f...
SQL Script: Adding Columns in DB Table Copy ALTER TABLE Employee ADD Address VARCHAR(100), City VARCHAR(25), PinCode integer;The following ALTER command adds Address, city, and Pin Code columns to the Employee table in Oracle database. Notice that it supports the different data types. ...
table_options signifies table options of the kind that can be used in the CREATE TABLE statement, such as ENGINE, AUTO_INCREMENT, AVG_ROW_LENGTH, MAX_ROWS, ROW_FORMAT, or TABLESPACE. For descriptions of all table options, see Section 15.1.20, “CREATE TABLE Statement”. However, ALTER ...
NOTE: Create table is a form of data-definition language (DDL) statement. These change the objects in your database. Oracle Database runs a commit before and after DDL. So if the create works, it's saved to your database.You can also create a table based on a select statement. ...