Difference between revisions of "KEY Table Constraint"
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| − | KEY [<cTagName>] (column1[column2,…]) | + | KEY [<cTagName>] (column1 [column2,…]) |
Revision as of 17:24, 19 March 2009
Contents
KEY
Class
Table Constraints
Purpose
Table constraint to define an index key
Syntax
KEY [<cTagName>] (column1 [column2,…])
See Also
ALTER TABLE, CONSTRAINTS, CREATE TABLE
Description
A constraint is used to define rules that help to provide data integrity. TABLE constraints apply to table-based operations. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.
The KEY table constraint is used to define an index key. The index is built on the column or columns specified and given the name as defined in <cTagName>. The INDEX table constraint can be used in the same way.
Example
set sql to mysql CREATE TABLE contact (LastName char(25), FirstName char(25), KEY FullName (LastName, FirstName));
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
