#1241-Operandshouldcontain一column(s)

#1241 - Operand should contain 1 column(s)
SELECT o . * , (
SELECT count( * )
FROM purn_order_product AS op
WHERE op.op_oordernum = o.o_num
) AS op_cnt, (

SELECT *
FROM purn_order_product AS op
INNER JOIN purn_product AS p ON ( p.p_it = op.op_pcode )
WHERE op.op_oordernum = o.o_num
ORDER BY op.op_uid ASC
LIMIT 1
) AS p_info
FROM purn_order AS o
ORDER BY o_rdate DESC
LIMIT 0 , 50

请问一下，
上面的SQL语句，提示出错：
#1241 - Operand should contain 1 column(s)
这个怎么解决？
请详细一些。
谢谢
------解决思路----------------------
SELECT o . * ,
(SELECT count( * ) FROM purn_order_product AS op WHERE op.op_oordernum = o.o_num) AS op_cnt,
(SELECT * FROM purn_order_product AS op INNER JOIN purn_product AS p ON ( p.p_it = op.op_pcode )
WHERE p.op_oordernum = o.o_num ORDER BY op.op_uid ASC LIMIT 1 ) AS p_info
FROM purn_order AS o
ORDER BY o_rdate DESC
LIMIT 0 , 50

套红的地方有问题！
你不可能将多个字段赋予一个别名，这在逻辑上是说不通的
那个 * 应该，也只能是一个明确的列名