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SQL Anywhere 11.0.0 » UltraLite - Database Management and Reference » UltraLite SQL Reference » UltraLite SQL function reference » Alphabetical list of functions

 

TSEQUAL function [System] (deprecated)

Compares two timestamp values and returns whether they are the same.

Syntax
TSEQUAL ( timestamp1, timestamp2 )
Parameters
  • timestamp1   Timestamp expression.

  • timestamp2   Timestamp expression.

Remarks

The TSEQUAL function can only be used in a WHERE clause and is most commonly used as part of an UPDATE statement.

If timestamp1 is equal to timestamp2, a row has changed since it was fetched. If the row changed, its timestamp has been modified and the TSEQUAL function returns FALSE. When the TSEQUAL function returns FALSE, the application determines that no rows were updated and assumes that the row was modified by another user. The updated row is re-fetched.

You can use the TSEQUAL function to determine whether a row has been changed since it was fetched.

See also
Standards and compatibility
  • SQL/2003   Vendor extension.

Example

Suppose you create a TIMESTAMP column Products.LastUpdated to store the timestamp for the last time the row was updated. The following UPDATE statement uses the TSEQUAL function to determine whether to update the row. If the value of LastUpdated is '2010/12/25 11:08:34.173226', the row is updated.

UPDATE Products
SET Color = 'Yellow'
WHERE ID = '300'
AND TSEQUAL( LastUpdated, '2010/12/25 11:08:34.173226' );