ELSE 'Gift to impress relatives' END AS "Range", Title FROM titles where CASE WHEN price IS NULL THEN 'Unpriced' WHEN price < 10 THEN 'Bargain' WHEN price BETWEEN 10 and 20 THEN 'Average' ELSE 'Gift to impress relatives' END in('Average','Bargain') GROUP BY CASE WHEN price IS NULL...
order_id,CASEWHENorder_amount>1000THEN'High'WHENorder_amount>500THEN'Medium'ELSE'Low'ENDASorder_priorityFROMorders; 3. 在 WHERE 子句中使用 CASE 使用SQL CASE 语句根据特定条件过滤数据。 代码语言:javascript 复制 SELECT*FROMcustomersWHERECASEWHENcountry='China'THENsales_region='Asia'WHENcountry='UK'TH...
END)) AS CurrentToNextDiff FROM CTE WHERE ABS(PrevValue - NextValue) / ( CASE WHEN NextValue > PrevValue THEN PrevValue ELSE NextValue END) < 0.2 AND ABS(CurrentValue - PrevValue) / ( CASE WHEN CurrentValue > PrevValue THEN PrevValue ELSE CurrentValue END) > 2 AND ABS(CurrentValue ...
CASE 表达式SELECT ProductID, Name,CASEClassWHEN'H'THENROUND( (ListPrice * .6), 2)WHEN'L'THENROUND( (ListPrice * .7), 2)WHEN'M'THENROUND( (ListPrice * .8), 2)ELSEROUND( (ListPrice * .9), 2)ENDAS DiscountPriceFROM Production.Product; 子查询SELECT Prd.ProductID, Prd.Name,( SEL...
select case when sex = '1' then '男' when sex = '2' then '女' else null end as '性别' sum(population) as '全国' sum(case when pref_name = ' 德岛' then population else 0 end ) as '德岛' sum(case when pref_name = ' 香川' then population else 0 end ) as '香川' sum(ca...
Last_Value(値 ignore nulls) over句 が基本的な使い方ですが、Last_Value(case when 条件 then 値 end ignore nulls) over句 というふうに、case式を組み合わせて使うほうが多いです。 Copy Copied to Clipboard Error: Could not Copy create table IgnoreNullsSample1(ID,SortKey,Val) as select 555...
LEFT JOIN subscriptions AS s2 ON s1.user_id != s2.user_id AND s1.start_date <=s2.end_date AND s1.end_date >=s2.start_date GROUP BY s1.user_id 使用 CASE子句根据给定用户的s2.user_id值来标记1和0。最终输出如下：掌握SQL需要大量实践，今天就从解决这5个棘手问题开始吧！留言点赞关注 ...
USE AdventureWorks2022; GO CREATE PROCEDURE MyProc2( @d datetime ) AS BEGIN DECLARE @d2 datetime SET @d2 = @d+1 SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE OrderDate > @d2 END; 在SQL Server 中优化 SELECT 中的MyProc2 语句时,@d2 的值是未知的。 因此,查询优化器为 OrderDate >...
sql 语法 case when --demo1 case 搜索函数 case when xxx then xxx else endselectid,casewhenscore<60then'low'whenscore<90then'middle'else'high'endasrankfromtest--demo2 简单 case 函数 case field when xxx then xxx else endselectidcasescorewhen0then'bad'when100then'good'else'middle'end ...
SELECT CASE WHEN score<60 THEN "不及格" WHEN score>=60 and score<85 THEN "良" WHEN score>=85 THEN "优秀" ELSE "未知" END AS "阶段" ,count(DISTINCT a.s_id) as "包含人数" from score a INNER JOIN student b on a.s_id=b.s_id GROUP BY CASE WHEN score<60 THEN "不及格" ...