Mysql 正在计算按分组的行数

我有一个这样的查询，

和COUNT（lsa）=6

位显然是无效的语法。我完全迷路了

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我想要实现的是一个列表，按

lsa

之和排序，按

uid

分组，仅当该uid有6个条目时，即在该“组”中。我该怎么做呢？

按聚合进行过滤是有效的，但这需要进入

HAVING

子句，而不是

WHERE

中使用

SELECT id,name,SUM(`lsa`) AS lst FROM 
    table_a AS sn,
    table_b AS fb 
WHERE sn.uid=fb.uid 
  AND COUNT(`lsa`)=6 
GROUP BY sn.uid 
ORDER BY SUM(`lsa`)

相反

SELECT id,
       name,
       SUM(`lsa`) AS lst
FROM   table_a AS sn
       JOIN table_b AS fb
         ON sn.uid = fb.uid  /*Using Explicit Join syntax*/
GROUP  BY sn.uid,            /*And avoiding MySQL GROUP BY extension*/
          id,
          name
HAVING COUNT(`lsa`) = 6
ORDER  BY SUM(`lsa`)