需要选择查询转换与功能的SQL

Question

select id from u where tKey in (select id from t where tlkey = 1117) 
and u.ckey = 15 
union all 
select * from u where tKey in (select id from t where tlkey = 1116) 
and u.ckey = 15 
union all 
select * from u where tKey in (select id from t where tlkey = 16) 
and u.ckey = 15 
union all 
select * from u where tKey in (select id from t where tlkey = 1118) 
and u.ckey = 15 
union all 
select * from u where tKey in (select id from t where tlkey = 1119) 
and u.ckey = 15 

表U： -

id  tKey 
16  1047 
20  34 
35  34 
1116 1048 
1117 1048 
1118 1047 
1119 1049 

表t： -

id  tlkey 
34  16 
1047 1116 
1048 1117 
1049 1118 

预期输出： -

id 
1116 
1117 
16 
1118 
20 
35 
1119 

打招呼

我想把这个查询转换为SQL与函数我不明白我该怎么做。第一个查询输出是（1117,1116） 第二个查询输出是（16,1118）意思是我们需要用第一个查询输出到第二个然后去最后一个级别我不知道最后一个是什么 我该怎么做请帮我

Answer 1

它看起来像你想从表中选择一个值在一个范围内的id。

您是否在内部查询中尝试过IN运算符？ 这样的问题：

SELECT * FROM u 
WHERE tKey IN (
    SELECT id 
    FROM t 
    WHERE tlkey IN (1117, 1116, 16, 1118, 1119) 
) 
AND u.ckey = 15