Question

我编写了以下mysql查询

SELECT distinct name, date
FROM table1
JOIN table2 ON (table2.item_id = table1.item_id)
where table1.id IN (SELECT run_id FROM 
table3 where table3.status = 'FAIL') and table1.createdate >= '2011-01-01'
 ;

我想在输出中添加message中的其他字段table3。

我想这可能涉及在查询中加入3个表。请告诉我如何实现这一目标。

Answer 1

试试这个

SELECT distinct name, date, T3.message
FROM table1
JOIN table2 ON (table2.item_id = table1.item_id) 
INNER JOIN (SELECT run_id FROM 
table3 where status = 'FAIL') T3 ON T3.run_id = table1.id
where table1.createdate >= '2011-01-01'

Answer 2

试试这个： -

SELECT DISTINCT T1.NAME , T1.DATE , T3.MESSAGE
FROM TABLE1 T1
JOIN TABLE2 T2
ON
T1.ITEM_ID = T2.ITEM_ID
INNER JOIN TABLE3 T3
ON
T1.ID = T3.RUN_ID
WHERE T3.STATUS = 'FAIL' AND T1.CREATEDATE >= '2011-01-01';

Answer 3

没有足够的信息来完全回答这个问题。我们也想知道：

status列是来自table1还是来自table3
是否可以存在多个table3条记录，runid与table1.id值匹配？
如果可以，您希望显示哪个table3.message值？

如果不知道这些信息，我们所能做的就是猜测。这是我的猜测：

SELECT distinct name, date, message
FROM table1 t1
INNER JOIN table2 t2 ON t2.item_id = t1.item_id
INNER JOIN table3 t3 on t1.id =t3.run_id AND t3.status = 'FAIL'
WHERE t1.createdate >= '2011-01-01'

Answer 4

试试这个：

从table1 t1，table2 t2，table3 t3中选择不同的名称，日期和消息，其中t1.item_id = t2.item_id和t1.item_id = t3.item_id 和t3.status =＆＃39;失败＆＃39; AND t1.createdate＆gt; = to_date（＆＃39; 2011-01-01，＆＃39; YYYY-DD-MM＆＃39;）;

MySQL在三个表上编写连接

4 个答案: