标签：sdn 分享 else location 导入 images 实现 暴力 blog
多条件排序可以通过在order by语句后面使用case when then条件语句来实现。
select * from 表名 ORDER BY case when 条件 then 0 else 1 end
例子：
共有id，case_type，case_location，case_way四个字段。
INSERT INTO "XIANGZH"."case_test" VALUES (‘1‘, ‘盗窃案‘, ‘台东‘, ‘技术开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘88‘, ‘谋杀案‘, ‘台东‘, ‘技术开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘99‘, ‘盗窃案‘, ‘江西路‘, ‘技术开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘5‘, ‘盗窃案‘, ‘台东‘, ‘暴力开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘6‘, ‘盗窃案‘, ‘江西路‘, ‘暴力开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘7‘, ‘谋杀案‘, ‘台东‘, ‘暴力开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘8‘, ‘谋杀案‘, ‘江西路‘, ‘技术开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘9‘, ‘谋杀案‘, ‘江西路‘, ‘暴力开锁‘); INSERT INTO "XIANGZH"."case_test" VALUES (‘10‘, ‘盗窃案‘, ‘台东‘, ‘技术开锁‘);
未排序截图：
select * from "case_test" ORDER BY case when "case_type"=‘盗窃案‘ then 0 else 1 end, case when "case_location" = ‘台东‘ then 0 else 1 end, case when "case_way" = ‘技术开锁‘ then 0 else 1 end ASC
查询结果是按照条件分组排序，截图：
select * from "case_test" ORDER BY case when "case_type"=‘盗窃案‘ and "case_location" = ‘台东‘ and "case_way" = ‘技术开锁‘ then 0 when "case_type"=‘盗窃案‘ and "case_location" = ‘台东‘ then 1 when "case_type"=‘盗窃案‘ and "case_way" = ‘技术开锁‘ then 2 when "case_location" = ‘台东‘ and "case_way" = ‘技术开锁‘ then 3 when "case_type"=‘盗窃案‘ then 4 when "case_location" = ‘台东‘ then 5 when "case_way" = ‘技术开锁‘ then 6 else 7 end
查询结果是按照满足条件的个数排序，截图：
如果有更合理的sql写法，欢迎留言讨论。
参考：
标签：sdn 分享 else location 导入 images 实现 暴力 blog
原文地址：http://www.cnblogs.com/Jason-Xiang/p/7026354.html
