下面这段SQL语句，修改成MySQL语句；SELECT * FROM (SELECT N, KJQJ, CODE_ORG, ZZNAME, GYSNAME, GYSBM, DJLX, NVL(BAL_ORI, LAG(BAL_ORI IGNORE NULLS) OVER(ORDER BY 1)) BAL_ORI, NVL(BAL_LOC, LAG(BAL_LOC IGNORE NULLS) OVER(ORDER BY 1)) BAL_LOC FROM (SELECT N, KJQJ, CODE_ORG, ZZNAME, GYSNAME, GYSBM, DJLX, CASE WHEN N = 1 AND BAL_ORI IS NULL THEN 1234567890 ELSE BAL_ORI END BAL_ORI, CASE WHEN N = 1 AND BAL_LOC IS NULL THEN 1234567890 ELSE BAL_LOC END BAL_LOC FROM T_PAYABLE_1_2 T)) TT WHERE TT.BAL_ORI != 1234567890 AND TT.BAL_LOC != 1234567890

在MySQL中，LAG函数的语法略有不同。以下是将给定的Oracle SQL语句转换为等效的MySQL语句：

SELECT *
FROM (
    SELECT N,
           KJQJ,
           CODE_ORG,
           ZZNAME,
           GYSNAME,
           GYSBM,
           DJLX,
           IFNULL(BAL_ORI, LAG(BAL_ORI) OVER(ORDER BY 1)) BAL_ORI,
           IFNULL(BAL_LOC, LAG(BAL_LOC) OVER(ORDER BY 1)) BAL_LOC
    FROM (
        SELECT N,
               KJQJ,
               CODE_ORG,
               ZZNAME,
               GYSNAME,
               GYSBM,
               DJLX,
               IF(N = 1 AND BAL_ORI IS NULL, 1234567890, BAL_ORI) BAL_ORI,
               IF(N = 1 AND BAL_LOC IS NULL, 1234567890, BAL_LOC) BAL_LOC
        FROM T_PAYABLE_1_2 T
    ) TT
) TT
WHERE TT.BAL_ORI != 1234567890
  AND TT.BAL_LOC != 1234567890;

注意，MySQL中使用IFNULL函数来替代Oracle SQL中的NVL函数，以处理NULL值的替换。此外，LAG函数在MySQL中的语法稍有不同，不需要使用IGNORE NULLS参数。在IF语句中，用IF来替代CASE语句来进行条件判断。