select @sql = @sql + ' , max(case subject when ''' + subject+ ''' then score else 0 end) [' + subject+ ']' from (select distinct subject from Stu) as a set @sql = @sql + ' from Stu group by name' print @sql --打印生成的sql exec(@sql) --执行该sql 注: case when的...
insertintot (col_came, col_sex)values(string_value,casewhenstring_valuelike'%a'then'F'else'M'end);
SQL语句 select name as ‘名字’, (case sex when 0 then ‘女’ else ‘男’ end) as ‘性别’ from test.student; ps.最后的 ‘end’ 别丢了,我刚开始使用的时候我就有这个毛病,并且一般的case when语句都会比较长,最好添加小括号包起来,这样更容易阅读。 查询结果 范围转换 有的时候,也会遇到这种...
insert into test_case2 values(1,'aa'); insert into test_case2 values(2,'bb'); insert into test_case2 values(3,'cc'); insert into test_case2 values(6,'ee'); commit; 4、两表关联,并编写case when的语句 select t.*, case when b.id is not null then '存在' else '不存在' end ...
1 打开“SQL Server Management Studio”管理工具，创建一张测试表：CREATE TABLE tblCaseWhen( Id varchar(40) NOT NULL, Col1 varchar(50) NULL, Col2 int NULL, Col3 varchar(50) NULL, Col4 varchar(50) NULL)2 往测试表中插入测试数据：insert into tblCaseWhen(Id, Col1, Col2) values(&...
SQL INSERT INTO SELECT 示例 将“Suppliers” 复制到 “Customers”(未填充数据的列将包含 NULL): INSERTINTOCustomers(CustomerName,City,Country)SELECTSupplierName,City,CountryFROMSuppliers; 1. 2. 将“Suppliers” 复制到 “Customers”(填充所有列): ...
代码语言:sql AI代码解释 CASEWHENcondition1THENresult1WHENcondition2THENresult2WHENconditionNTHENresultNELSEresultEND; SQL CASE 示例 在下面的示例中,我们使用了 Northwind 示例数据库中的 "OrderDetails" 表的一部分选择: SQL CASE 示例 以下SQL 遍历条件并在满足第一个条件时返回一个值: ...
insert into test_case2 values(2,'bb');insert into test_case2 values(3,'cc');insert into test_case2 values(6,'ee');commit;4、两表关联，并编写case when的语句 select t.*,case when b.id is not null then '存在' else '不存在' end flag from TEST_CASE1 t, TEST_CASE2 ...
二、CASE WHEN条件表达式函数 类似JAVA中的IF ELSE语句。 格式: CASE WHEN condition THEN result [WHEN...THEN...] ELSE result END 1. 2. 3. 4. 5. 6. 7. SQL语言演示: CASE WHEN SCORE = 'A' THEN '优' WHEN SCORE = 'B' THEN '良' ...
CREATE VIEW ABCasslectW=casewhen A2 is null then B2else A2end,E=casewhen A1 is null then C1else A1endfrom A join C on A1=C1 join B on C2=B2或者简化一下，直接写：CREATE VIEW ABCasslectW=ISNULL(A2,B2),E=ISNULL(A1,C1)from A join C on A1=C1 join B on C2=B2...