使用CASE WHEN完成总数下各数值信息

1. 需求：计算 全日制 哲学，经济学，法学，教育学，文学，历史学，理学，工学，农学，医学，军事学各占总人数多少

2. 展示
   

3. 代码

SELECT
	COUNT( 1 ) AS allcount,
	SUM( CASE WHEN garduate_school_major = 11 THEN 1 ELSE 0 END ) AS 医学,
	SUM( CASE WHEN garduate_school_major = 10 THEN 1 ELSE 0 END ) AS 农学,
	SUM( CASE WHEN garduate_school_major = 12 THEN 1 ELSE 0 END ) AS 军事学,
	SUM( CASE WHEN garduate_school_major = 13 THEN 1 ELSE 0 END ) AS 普师,
	SUM( CASE WHEN garduate_school_major = 2 THEN 1 ELSE 0 END ) AS 哲学,
	SUM( CASE WHEN garduate_school_major = 3 THEN 1 ELSE 0 END ) AS 经济学,
	SUM( CASE WHEN garduate_school_major = 4 THEN 1 ELSE 0 END ) AS 法学,
	SUM( CASE WHEN garduate_school_major = 5 THEN 1 ELSE 0 END ) AS 教育学,
	SUM( CASE WHEN garduate_school_major = 6 THEN 1 ELSE 0 END ) AS 文学,
	SUM( CASE WHEN garduate_school_major = 7 THEN 1 ELSE 0 END ) AS 历史学,
	SUM( CASE WHEN garduate_school_major = 8 THEN 1 ELSE 0 END ) AS 理学,
	SUM( CASE WHEN garduate_school_major = 9 THEN 1 ELSE 0 END ) AS 工学 
FROM
user

4. 效果