在SQL的CASE块中嵌套逻辑可以通过多层嵌套的方式实现。CASE语句是一种条件表达式,可以根据不同的条件返回不同的结果。 下面是一个示例,展示了如何在SQL的CASE块中嵌套逻辑: 代码语言:txt 复制 SELECT column_name, CASE WHEN condition1 THEN result1 WHEN condition2 THEN CASE
问where子句中的SQL using caseENWhere 是一个约束声明，使用Where约束来自数据库的数据，Where是在结果...
SELECT DISTINCT A.Store_Name FROM Localtion A LEFT JOIN Store_Info B USING(Store_Name) WHERE B.store_Name IS NULL; 1. 2. 3. 7、 CASE ---是SQL用来做为IF一THEN一ELSE之类逻辑的关键字语法 SELECT CASE(“栏位名”) WHEN “条件1” THEN “结果1” WHEN "条件2” THEN “结果2” “… ...
We have constantly issues with different kinds of customers and based on their status or payment history, you want to join them to the loyalty tables. The focus was to come up with a solution that minimises the extra reads on the other tables but also to add this to a stored proc to m...
In order to have a table to demonstrate using the CASE expression I will be using the script in Listing 1 to create a sample table namedMyOrder. If you would like to follow along with my examples and run them on your SQL Server instance you can create this table in a database of you...
Using CASE 9.Use CASE to show the name of each teacher followed by 'Sci' if the teacher is in dept 1 or 2 and 'Art' otherwise. 请使用CASE显示每个教师的姓名,如果教师在部门1或2中,显示“Sci”,否则显示“Art”。 select name,case when dept in (1,2) then 'Sci' else 'Art' end from...
[CDATA[ select * from sqltoy_user_log t -- userId 作为分库关键字段属于必备条件 where t.user_id=:userId #[and t.log_date>=:beginDate] #[and t.log_date<=:endDate] ]]> </value> </sql> <!-- 演示分表 --> <sql id="qstart_sharding_table_case"> <sharding-table tables="...
END ends the CASE statement AS specifies the name alias_name for the new column table is the name of the table. Note: The syntax of CASE always starts with the CASE keyword and ends with the END keyword followed by a column name alias. Example: Voter Eligibility Using SQL CASE -- add...
I have a stored procedure that uses case statement. Each When clause has an update statement. I am trying to call this stored procedure multiple times and based on the pass parameter, I run an update statement. Unfortunately, the update statement does not execute correctly. There are no...
9. CASE WHEN 的用法 Use CASE to show thenameof each teacher followed by 'Sci' if the teacher is indept1 or 2 and 'Art' otherwise. SELECT name, (CASE WHEN dept IN (1, 2) THEN 'Sci' ELSE 'Art' END) FROM teacher 10. Use CASE to show the name of each teacher followed by 'Sci...