表语句： DROP TABLE IF EXISTS `yj_item_plan`; CREATE TABLE `yj_item_plan` ( `id` big...
CASE subject WHEN '英语' THEN score END AS wy from Stu ) tempStu group by name 方法二:课程只有语文、数学、物理这三门课程则可以使用静态sql 来实现 Sql2000 select name as 姓名, max(case subject when '语文' then score else 0 end) 语文, max(case subject when '数学' then score else 0 ...
{ sql_statement|statement_block|BREAK|CONTINUE} 参数: Boolean_expression:返回 TRUE 或 FALSE 的表达式。 如果布尔表达式中含有 SELECT 语句,则必须用括号将 SELECT 语句括起来。 {sql_statement | statement_block}:Transact-SQL 语句或用语句块定义的语句分组。 若要定义语句块,请使用控制流关键字 BEGIN 和 EN...
除了pandas apply能实现case when的功能外，numpy的select方法也能搞定，而且更为通用、简洁，建议试试。...
正文 1 case when ... then .. when .. then ... end这种表达式，是sql的不同条件分支结果。举例如下，1、创建数据表，create table test_student(stu_id number, class_id number);2、插入测试数据，insert into test_student values(1,1001);insert into test_student values(2,1001);insert into test...
SqlServer Case when then用法总结 SELECT d.DicName , --DevelopMode ISNULL(NULL,NULL) , --Orgid b.FullName , --Areid c.DicName , --InvestProperty f.DicName , --TwoProperty PJName , PJLength , PJWidth , UseArea , BuildArea ,...
SQL Server在select内嵌套Case 、 下面的案例当前是select查询的一部分。本质上说,如果FreeStockQuantity为0,则使用另一个字段中的值,除非该值为0或null。然后,它将结果返回为“Quantity” CASE WHEN FreeStockQuantity <= 0 AND (AnalysisCode19 > 0 OR AnalysisCode19 is NOTNULL) THEN AnalysisCode19END AS...
CASE WHEN xxx = ‘x’ THEN ‘x’ WHEN xxx = ‘x’ THEN ‘x’ ELSE ‘xx’ END 扩展 AI检测代码解析 select case when total > max then 2 when total < min then 1 else 0 end from ta 1. 2. 3. 4. 5. 6. update AI检测代码解析 ...
USEAdventureWorks2022; GOSELECTProductNumber,Category=CASEProductLineWHEN'R'THEN'Road'WHEN'M'THEN'Mountain'WHEN'T'THEN'Touring'WHEN'S'THEN'Other sale items'ELSE'Not for sale'END,NameFROMProduction.ProductORDERBYProductNumber; GO B. Use a SELECT statement with a searched CASE expression ...
USEAdventureWorks2022; GOSELECTProductNumber,Category=CASEProductLineWHEN'R'THEN'Road'WHEN'M'THEN'Mountain'WHEN'T'THEN'Touring'WHEN'S'THEN'Other sale items'ELSE'Not for sale'END,NameFROMProduction.ProductORDERBYProductNumber; GO B. Use a SELECT statement with a searched CASE expression ...