After you declare a cursor, you must open it to fetch, update, or delete rows. Opening a cursor lets Adaptive Server begin to create the cursor result set by evaluating the select statement that defines the cursor and makes it available for processing. The syntax for the open statement is:
open cursor_name
You cannot open a cursor that is already open or that has not been defined with the declare cursor statement. You can reopen a closed cursor to reset the cursor position to the beginning of the cursor result set.
Depending on the cursor's type and the query plan, a worktable may be created and populated when you open the cursor.
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