经典sql总结(2)

经典sql总结(2)

 

如何做呢,跟上文区别不大。

我建个表,输入以下

 

经典sql总结(2)

1 select year,
2 (select amount from info2 as t2 where t2.year=t.year and t2.mouth=1) as m1,
3 (select amount from info2 as t3 where t3.year=t.year and t3.mouth=2) as m2,
4 (select amount from info2 as t4 where t4.year=t.year and t4.mouth=3) as m3
5 from info2 as t group by year;

 

经典sql总结(2)

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