SQL Language Guide : 5. Embedded SQL : Data Manipulation with Cursors : Open a Cursor
 
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Open a Cursor
To open a cursor, use the OPEN statement:
EXEC SQL OPEN cursor_name [FOR READONLY];
Opening a cursor executes the associated SELECT statement. The rows returned by the SELECT statement are stored in a temporary result set. The cursor is positioned before the first row in the result table.
Note:  If a cursor is closed and reopened, the cursor is repositioned to the beginning of the result table, and does not resume the position it had before it was closed.