合成结果与左连接加入

Question

SELECT name,trans FROM skyplan_deploy.deploy_sids d WHERE apt='KBOS' AND name != trans 
LEFT JOIN 
(SELECT distinct c.sid_ident as name,c.fix_ident from corept.std_sid_leg as c 
    INNER JOIN 
     (SELECT sid_ident,transition_ident,max(sequence_num) seq,route_type 
     FROM corept.std_sid_leg 
     WHERE data_supplier='J' AND airport_ident='KBOS' 
     GROUP BY sid_ident,transition_ident)b 
     ON c.sequence_num=b.seq and c.sid_ident=b.sid_ident and  c.transition_ident=b.transition_ident 
     WHERE c.data_supplier='J' and c.airport_ident='KBOS')right_tbl 
ON d.name=right_tbl.sid_ident; 

这是我code..when执行我在LEFT JOIN说，语法是wrong.Anybody帮助，请...我已经通了语法教程，但得到错误结果空手而归。谢谢。

Answer 1

将WHERE子句移到查询的末尾。另外，WHERE条款中的那个列trans是什么？它从哪里来的？如果它是一个字符串，那么，把它放在引号中。

应该这样写：

SELECT 
    name, 
    trans 
FROM skyplan_deploy.deploy_sids d 
LEFT JOIN 
(
    SELECT distinct c.sid_ident as name, c.fix_ident 
    from corept.std_sid_leg as c 
    INNER JOIN 
    (
     SELECT sid_ident, transition_ident, max(sequence_num) seq, route_type 
     FROM corept.std_sid_leg 
     WHERE data_supplier='J' AND airport_ident='KBOS' 
     GROUP BY sid_ident,transition_ident 
    ) b ON c.sequence_num=b.seq 
     and c.sid_ident = b.sid_ident 
     and c.transition_ident = b.transition_ident 
    WHERE c.data_supplier='J' and c.airport_ident='KBOS' 
) AS right_tbl ON d.name = right_tbl.sid_ident 
WHERE apt = 'KBOS' 
    AND right_tbl.sid_ident IS NULL ;