數據庫表結構如下:
SQL語句:
select t.code1, sum(t.num) as num FROM (SELECT CASE WHEN code1 <= 2 THEN 2 WHEN code1 > 2 THEN 4 END code1, num FROM citys) t GROUP BY t.code1;
執行效果:
本文部分轉自;https://www.cnblogs.com/linbo3168/p/12753260.html
select t.code1, sum(t.num) as num FROM (SELECT CASE WHEN code1 <= 2 THEN 2 WHEN code1 > 2 THEN 4 END code1, num FROM citys) t GROUP BY t.code1;
本文部分轉自;https://www.cnblogs.com/linbo3168/p/12753260.html
本站轉載的文章為個人學習借鑒使用,本站對版權不負任何法律責任。如果侵犯了您的隱私權益,請聯系本站郵箱yoyou2525@163.com刪除。