我编写了一个sql来从Mysql中的两个表中选择记录: select IFNULL(b.father_id, 0) as bfi, IFNULL(b.id,0) AS bid,
a.competitor AS competitor,IFNULL(a.merchant_order_no,b.merchant_order_no)
我通过Qml + JS从表中读取数据,我需要100次返回,因为查询找不到数据: WHEN pourcenthour < pourcentcycle AND pourcenthourORDER BY pourcent DESC LIMIT 1SELECT IFNULL((CASE WHEN ...我有错误:
SELECT IFNULL(SELECT (CASE WHEN ...
在执行此代码时,当我插入年份不同于' this‘的事务时,结果显示两行结果相同: ifnull((SELECT COUNT(id) FROM (transaction)WHERE((Month(date)=1)AND (YEAR(date)='2017'))),0) AS `Jan`,
ifnull((SELECT COUNT(id) FROM (transaction)WHERE((Month(date)=2)AND (YEAR(date)='2017'))),0) AS `Feb`,