[英]How I can do this query in MySQL (multiple columns from different tables)
我想从不同的表中选择3列,但必须使用函数,这是我要执行的查询:
SELECT DISTINCT table1.sum(column1) as sumcol1,
table2.sum(column2) as sumcol2, table3.column3 as col3
FROM db1.table1, db1.table2, db1.table3
WHERE table1.id = 1 AND table2.id = 1 AND table3.id = 1;
注意:只有table3.id是唯一索引
我想要这张桌子:
|sumcol1|sumcol2|col3|
|1234556|5432113|432|
由于您没有提到逻辑。 看起来像放错了SUM
SELECT DISTINCT sum(table1.column1) as sumcol1,
sum(table2.column2) as sumcol2, table3.column3 as col3
FROM db1.table1, db1.table2, db1.table3
WHERE table1.id = 1 AND table2.id = 1 AND table3.id = 1;
我找到了解决方案,这很简单。
从db1.table1,db1.table2,db1.table3中选择DISTINCT sum(table1.column1)作为sumcol1,sum(table2.column2)作为sumcol2,table3.column3作为col3在哪里table1.id = 1 AND table2.id = 1 AND table3.id = 1;
我只是将table1.sum(column1)更改为sum(table1.column1),然后将table2.sum(column2)更改为sum(table2.column2)
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