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ALTER TABLE statement. Modifies a table definition or disables dependent views. ALTER TABLE [owner.] table-name { alter-clause, ... alter-clause : ADD create-clause . | ALTER column-name column-alteration . | ALTER [ CONSTRAINT constraint-name ] CHECK ( condition ) . | DROP drop-object . | RENAME rename-object . | table-alteration.
- Drop Table Statement
DROP TABLE [ IF EXISTS] [ owner.]table-name. Remarks. When...
- Strings
A string can occur in SQL: as a string literal. A string...
- Alter Materialized View Statement
If you alter a materialized view owned by another user, you...
- Backup Statement
The BACKUP statement performs a server-side backup. To...
- Global Variables
Name of the language in use by the connection....
- Sa_Reset_Identity System Procedure
The next identity value generated for a row inserted into...
- Special Values
Special values can be used in expressions, and as column...
- SQL Data Types
SQL data types Character data types Numeric data types Money...
- Drop Table Statement
alter table table_name drop partition partition_name [, partition_name]... Parameters table_name. is the name of the table to change. Specify the database name if the table is in another database, and specify the owner’s name if more than one table of that name exists in the database.
The ALTER TABLE statement changes table attributes (column definitions and constraints) in a table that was previously created. The syntax allows a list of alter clauses; however, only one table constraint or column constraint can be added, modified, or deleted in each ALTER TABLE statement.
To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype; My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype; Oracle 10G and later: ALTER TABLE table_name.
alter table. Description. Adds new columns to a table; drops or modifies existing columns; adds, changes, or drops constraints; changes properties of an existing table; enables or disables triggers on a table. Syntax.
Usage. Component Integration Services processes the alter table command when the table on which it operates has been created as a proxy table. Component Integration Services forwards the request (or part of it) to the server that owns the actual object.
28 Ιουν 2012 · To alter any table in order to change the datatype of some field : ALTER TABLE <table_name> MODIFY <column_name> <new_datatype> For example: In order to change the datatype of any column 'emp_id' from int to varchar, you need to :
