SQL 条件语句 (IF, CASE WHEN, IFNULL) 1、IF 1.1 表达式: 1 IF( expr1 , expr2 , expr3 ) expr1条件,条件为true,则值是expr2 ,false,值就是expr3 示例; 1 2 3 4 5 6 SELECT o.id,u.account,catagory.`name`,orderTime,detail.amount,periodtim
CASE WHEN 和COUNT CASE WHEN 和SUM CASE WHEN 和 AVG函数 与AVG函数结合,可实现计算百分比的功能 部分例子参考来自:https://www.sqlshack.com/case-statement-in-sql 你的点赞是我持续更新的动力~ 谢谢 Thanks♪(・ω・)ノ SQL学习笔记 友情链接: Y:SQL学习笔记 - 窗口函数OVER19 赞同 · 0 评论...
b.STATUS, a.PAYMENTS_PENDING,CASEWHENc.PPAPPLSTRAT='Y'ANDa.PAYMENTS_PENDING='Y'ANDc.DAPPLSTRAT='Y'AND(b.PROBLEM_IDISNOTNULLANDb.STATUS<>'C')THEN'Y'WHENc.PPAPPLSTRAT='Y'ANDa.PAYMENTS_PENDING='Y'ANDc.CAPPLSTRAT='Y'AND(b.PROBLEM_IDISNULLOR(b.PROBLEM_IDISNOTNULLANDb.STATUS='C')...
There are more than just 1 genre of music in the track table. Order the entries alphabetically to see some examples of songs that do not have a “GenreId” of 1. In the GenreType columnnullis returned for any values that did not satisfy the conditions of the CASE WHEN statement: SELECT...
在SQL中,CASE WHEN语句是一种条件表达式,它允许你根据不同的条件返回不同的值。当涉及到相加值时,你可以使用CASE WHEN语句来对满足特定条件的行进行求和。以下是一个基础概念的解释以及相关示例。 基础概念 CASE WHEN语句的基本语法如下: 代码语言:txt 复制 SELECT CASE WHEN condition1 THEN result1 WHEN condition...
MySQL中的case when 中对于NULL值判断的坑! sql中的case when 有点类似于Java中的switch语句,比较灵活,但是在Mysql中对于Null的处理有点特殊 Mysql中case when语法: 语法1: 1 2 3 4 5 CASE case_value WHEN when_value THEN statement_list ...
–简单Case函数 CASE sex WHEN ‘1’ THEN ‘男’ WHEN ‘2’ THEN ‘女’ ELSE ‘其他’ END ...
--⽐如说,下⾯这段SQL,你永远⽆法得到“第⼆类”这个结果 复制代码 代码如下: CASE WHEN col_1 IN ( 'a', 'b') THEN '第⼀类' SQL语句中case,when,then的用法 SQL语句中 case, when, then的⽤法 ⽤法如下bai: 复制代码 SELECT s.s_id, s.s_name, s.s_sex, CASE WHENs.s_sex...
CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ... WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN...
CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING. ...