[英]How to turn bring columns in rows using sql query?
使用此查询后,得到以下结果:
select SCHOOL_YEAR,COUNT(MUSIC) as ct,MUSIC from [table1]
group by SCHOOL_YEAR,MUSIC;
SCHOOL_YEAR ct MUSIC
2011 100 Piano
2011 50 Violin
2012 70 Piano
2012 150 Violin
我想要以下格式:
SCHOOL_YEAR Piano Violin
2011 100 50
2012 70 150
我该如何实现?
在原始表格上使用数据透视查询,但仅在学年进行汇总:
SELECT
SCHOOL_YEAR,
SUM(CASE WHEN MUSIC = 'Piano' THEN 1 ELSE 0 END) AS Piano,
SUM(CASE WHEN MUSIC = 'Violin' THEN 1 ELSE 0 END) AS Violin
FROM table1
GROUP BY
SCHOOL_YEAR
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