Web7 de set. de 2015 · You could see a performance gain in skipping rows that do not need to be updated only when the number of rows is large (less logging, less dirty pages to write to disk). When dealing with single row updates as in your case, the performance difference is completely negligible. If updating the rows in all cases makes it easier for you, do it. Web29 de abr. de 2011 · 0. The following is case where an sql update statement will return as no rows updated : UPDATE employees SET salary = 14 WHERE age > 40. ...basically …
null - How to handle no rows returned in an Oracle update using a ...
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SQL Server UPDATE lock and UPDLOCK Table Hints
Web26 de mai. de 2011 · It will only give you a count of the rows updated if using it with a SQLExec. "%SQLRows returns the number of rows affected by the most recent UPDATE, DELETE, or INSERT executed through the SQLExec function. %SQLRows can also be used after SELECT. It returns 0 if no rows are returned, a non-zero value if one or more … WebPDOStatement::rowCount() returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement executed by the corresponding PDOStatement object. For statements that produce result sets, such as SELECT, the behavior is undefined and can be different for each driver.Some databases may return the number of rows produced by … WebOn "INSERT INTO ON DUPLICATE KEY UPDATE" queries, though one may expect affected_rows to return only 0 or 1 per row on successful queries, it may in fact return 2. From Mysql manual: "With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row and 2 if an existing row is updated." great clips terrell tx