Updating cursor


20-Aug-2020 18:39

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The WHERE clause, required in the cursor update, specifies that the update occur to the row the cursor currently points to.

If the cursor is not pointing to a row, as is the case immediately after an OPEN or DELETE statement, a runtime error message is generated indicating that a fetch must first be performed.

A common programming error is to update the current row of a cursor, commit the change, and continue in a loop to repeat the process.

This process fails because the first commit closes the cursor.

The SQL postfix clause is most commonly used for clauses such as ORDER BY. The order of values should be in the same order as the fields.Attempting to do either results in an error indicating an ambiguous update operation.When executing a cursor update dynamically, using the PREPARE statement, the cursor must be open before the cursor UPDATE statement can be prepared.An SQL prefix clause is positioned in the first position and will be inserted between the SELECT keyword and the SELECT COLUMN LIST.

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The SQL prefix clause is most commonly used for clauses such as DISTINCT or ALL.

If a cursor definition has a query with multiple tables then only the table used in update statement is affected. OAuth Exception: (#10) To use 'Page Public Content Access', your use of this endpoint must be reviewed and approved by Facebook.