PostgreSQL的case when select tt.dict_labelas display_item,t1.ratiofrom (select t.product_level,round(sum(case when t.detect_result='2'then1else0end)::NUMERIC/count(1)::NUMERIC,4)as ratio from t_detect_record t where t.district='3'and t.e_commerce_platform='3' group by t.product_l...
PostgreSQL的case when select tt.dict_labelas display_item,t1.ratiofrom (select t.product_level,round(sum(case when t.detect_result='2'then1else0end)::NUMERIC/count(1)::NUMERIC,4)as ratio from t_detect_record t where t.district='3'and t.e_commerce_platform='3' group by t.product_l...
这里只能使用搜索case函数不能使用普通case函数,因为普通case函数when之后只能是等于判断。 SELECT info, ( CASE WHEN IN ( SELECT info FROM user2 ) THEN '数据一致' ELSE '数据不一致' END ) AS '比较结果' FROM user1 1. 2. 3. 4. 5. 三、结合分组统计数据 CREATE TABLE Country ( id int, city...
NAME, SUM (CASE col WHEN 0 THEN 1 ELSE 0 END) AS col1, SUM (CASE col WHEN 1 THEN 1 ELSE 0 END) AS col2 FROM test GROUP BY NAME; 1. 2. 3. 4. 5. 6. 7. 8. 结果:
以下是一个示例函数,演示如何在CASE内循环: 代码语言:sql 复制 CREATEORREPLACEFUNCTIONloop_with_case()RETURNSVOIDAS$$DECLAREcounterINT:=1;max_counterINT:=10;BEGINWHILEcounter<=max_counterLOOPCASEWHENcounter<5THEN-- 执行某些操作或返回某些结果RAISE NOTICE'Counter is less than 5: %',counter;WHENcounter...
在PostgreSQL中,CASE语句用于根据条件选择不同的FROM子句。它允许根据条件动态地选择要查询的表。 CASE语句的语法如下: ``` SELECT column1, column2, ...
SELECT SUM(CASE department_id WHEN 10 THEN 1 ELSE 0 END) AS dept_10_count, SUM(CASE department_id WHEN 20 THEN 1 ELSE 0 END) AS dept_20_count, SUM(CASE department_id WHEN 30 THEN 1 ELSE 0 END) AS dept_30_count FROM employees; dept_10_count|dept_20_count|dept_30_count| --...
```sql SELECT order_id, customer_id, amount, CASE WHEN amount < 100 THEN '小额订单' WHEN amount BETWEEN 100 AND 500 THEN '中等订单' ELSE '大额订单' END AS order_category FROM orders; ``` 在这个例子中,`CASE WHEN`语句根据`amount`字段的值返回相应的订单类别。通过这种方式,我们可以轻松地...
case when g.defpu like '1*%' then SUBSTRING(defpu,3,6) else g.defpu end as "测", g.VALIDPERIOD "保", r.rtlprc, --g.inprc, g.CNTINPRC , g.alc , gb.name, v.code, v.name, g.country, g.tm, g.orggid, nvl(sum(ts.quantity),0) , nvl(sum(ts.saleamt),0) , nvl(...
SELECT n.nspname as"Schema",c.relname as"Name",CASE c.relkind WHEN'r'THEN'table'WHEN'v'THEN'view'WHEN'm'THEN'materialized view'WHEN'i'THEN'index'WHEN'S'THEN'sequence'WHEN't'THEN'TOAST table'WHEN'f'THEN'foreign table'WHEN'p'THEN'partitioned table'WHEN'I'THEN'partitioned index'END ...