我正在寻找有关高级MySQL查询的帮助。我当前的查询,如下所示,工作正常。我想添加一个额外的字段,因此我不必创建单独的查询。新字段count(TableA.Field05
)应该会产生TableA
的记录总数。
TableA有10条记录 TableB有100条记录
SELECT count(TableB.Answer) AS unAnswered
FROM TableA
LEFT JOIN TableB
ON ( TableA.Field01 = TableB.fkField01 AND TableA.Field02 = TableB.fkField02 AND TableB.Answer = '1')
WHERE TableB.fkField03 IS NULL AND TableA.Field04 = 10
GROUP BY TableA.Field01, TableA.Field02
结果:
unAnswered = 8
这是正确的
期望的结果是:
unAnswered = 8
count(TableA.Field05) = 10
-
这是数据和结果的一个例子。
SELECT count(TableB.Answer) AS unAnswered
FROM TableA LEFT JOIN TableB ON ( TableA.Field01 = TableB.fkField01 AND TableA.Field02 = TableB.fkField02 AND TableB.Answer = '1')
WHERE TableB.fkField03 IS NULL AND TableA.Field04 = 10
GROUP BY TableA.Field01, TableA.Field02
TableA
Field01 = 1, Field02 = 1, Field03 = 10
Field01 = 1, Field02 = 2, Field03 = 21
Field01 = 1, Field02 = 3, Field03 = 22
Field01 = 1, Field02 = 4, Field03 = 34
TableB
Field01 = 1, Field02 = 1, Answer = 1
Field01 = 1, Field02 = 2, Answer = 1
Field01 = 1, Field02 = 3, Answer = 1
Field01 = 2, Field02 = 1, Answer = 1
Field01 = 2, Field02 = 2, Answer = 1
Field01 = 2, Field02 = 3, Answer = 1
Result
count(TableB.Answer) AS unAnswered = 1
Result trying to achive
count(TableB.Answer) AS unAnswered = 1
count(TableA.Field03) = 4
非常感谢任何帮助。
答案 0 :(得分:0)
如果您只想将tableA的数量添加到当前查询中,只需将其添加到您的select语句中:
'SELECT count(TableB.Answer)AS unAnswered,count(TableA.Field02)FROM TableA ...'