sql - Cursor, WHILE 循环如何在 DB2 i 系列中工作

Question

只是想了解“EXECUTE SQLStmt”会运行多少次，考虑到 DISTINCT Col 返回 5 行，而 COUNT(*) 返回 10 行。

DECLARE c1 Cursor with return for 
SELECT Distinct Col as LIB FROM Page.Libraries 
ORDER BY Col;

SET numrecs = 0;
SET numcount = 1;
SET c_LIB = ' ';

SELECT COUNT(*) INTO numrecs FROM Page.Libraries;

OPEN c1;
WHILE numcount <= numrecs DO
    P2 : BEGIN
        FETCH c1 INTO c_LIB;
        SQLStmt = 'insert statement' || c_LIB
        EXECUTE IMMEDIATE SQLStmt;
        SET numcount = numcount + 1;
    END P2;
END WHILE;

我熟悉 SQL Server，但对 Db2 语法感到困惑。