Difference between revisions of "INDEX Table Constraint"
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==Purpose== | ==Purpose== | ||
Table constraint to define an index key | Table constraint to define an index key | ||
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==Syntax== | ==Syntax== | ||
INDEX [<cTagName>] (column1[, column2,...]) | INDEX [<cTagName>] (column1[, column2,...]) | ||
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==See Also== | ==See Also== | ||
[[ALTER TABLE]], [[SQL Constraints|CONSTRAINTS]], [[CREATE TABLE]] | [[ALTER TABLE]], [[SQL Constraints|CONSTRAINTS]], [[CREATE TABLE]] | ||
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==Description== | ==Description== | ||
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The INDEX 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 [[KEY_Table_Constraint|KEY]] table constraint can be used in the same way. | The INDEX 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 [[KEY_Table_Constraint|KEY]] table constraint can be used in the same way. | ||
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==Example== | ==Example== | ||
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INDEX FullName (LastName, FirstName)) | INDEX FullName (LastName, FirstName)) | ||
</code> | </code> | ||
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==Products== | ==Products== | ||
Latest revision as of 10:20, 11 December 2012
Purpose
Table constraint to define an index key
Syntax
INDEX [<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 INDEX 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 KEY table constraint can be used in the same way.
Example
CREATE TABLE contact; (LastName char(25), FirstName char(25),; INDEX FullName (LastName, FirstName))
Products
Lianja, Lianja Server
