PostgreSQL 9.6是一种开源的关系型数据库管理系统,它支持广泛的数据类型和功能,适用于各种规模的应用程序。在PostgreSQL 9.6中,可以使用基于列总和的case-when子句来实现条件逻辑。 基于列总和的case-when子句是一种在查询中根据列的值进行条件判断和计算的方法。它的语法如下: 代码语言:txt 复制 SELECT column1, ...
在PostgreSQL中,可以使用CASE语句结合循环来实现在CASE内循环的功能。具体步骤如下: 1. 创建一个包含循环逻辑的函数:首先,使用CREATE FUNCTION语句创建一个函数,该函数...
SELECT * FROM table WHERE t1.id_status_notatka_1 = ANY (selected_type) AND t1.id_status_notatka_2 = ANY (selected_place) 在这里我想添加 CASE WHEN 所以我的查询是: SELECT * FROM table WHERE t1.id_status_notatka_1 = ANY (selected_type) AND t1.id_status_notatka_2 = ANY (selecte...
16 Postgres - using select statement inside CASE WHEN 2 PostgreSQL use case when result in where clause 1 Using CASE in PostgreSQL to SELECT different FROMs 1 How to skip case statement in sql? 3 PostgreSQL select columns based on case statement 0 query with case when 0 PostgreSQL ,...
casewhen语句第一种方式:casewhen表达式1then结果1when表达式2then结果2else结果nend举例1: select sum(casewhenrental_rate=0.99then1else0end)as"aa",sum(casewhenrental_rate=2.99then1else0end)as"bb",sum(casewhenrental_rate=4.99then1else0end)as"cc"from film;结果: aa bb cc341323336【注】:as后接...
postgresql pgadmin-4 我正在遵循一个视频教程,该教程处理CASE、WHEN和END AS</kbd]查询。pgAdmin可以通过SELECT找到它,但当使用CASE时,它就不存在了! 选择film_id,标题,描述,release_year,长度,等级, CASE 当language_id“1”时,则为“英语” 当language_id“2”时,则为“意大利语” WHEN language_id“3”...
but it doesn't work. The syntax is good but it fails in searching for anything. So my question is - how use CASE WHEN in WHERE clause. Short example: if a=0 then add some condition to WHERE (AND condition), if it's not then don't add (AND condition) sql postgresql Share Improve...
postgreSQL 应用case when的例子 select name, md5(indvl_id_nbr) as indvl_id_nbr, case when char_length(indvl_id_nbr)=18 or char_length(indvl_id_nbr)=15 then substring(indvl_id_nbr from 1 for 6) end as id_prefix, case when char_length(indvl_id_nbr)=18 then substring(indvl_id...
postgreSQL 应用case when的例子 select name, md5(indvl_id_nbr) as indvl_id_nbr, case when char_length(indvl_id_nbr)=18 or char_length(indvl_id_nbr)=15 then substring(indvl_id_nbr from 1 for 6) end as id_prefix, case when char_length(indvl_id_nbr)=18 then substring(indvl_id...
case when col IN ('a','b') then '第一' when col IN ('a') then '第二' else '其他' END (when col IN ('a') then '第二')将不会执行。 现在有pop这个表,数据如图所示 我现在想统计一下,各个省有多少人?也就是要把(广州,深圳,东莞,惠州)进行合并 ...