1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN
OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
...UPDATE salary SET sex = IF(sex = 'm', 'f', 'm') 也可以利用条件语句,在搜索的时候,直接进行数据转换 select *,(CASE WHEN sex='1'...参考资料: 1、Mysql if case总结 2、Leetcode swap salary 3、select case when if 的一些用法 4、IF Syntax...
1.3, selectLEN(oldbm),caseLEN(oldbm)when7then'0'+oldbmelseoldbmendas'oldbm'fromtemp_yb_dw_0711b 1.4,
CASE Syntax CASE WHENcondition1THENresult1 WHENcondition2THENresult2 WHENconditionNTHENresultN ELSEresult END; Demo Database Below is a selection from the "OrderDetails" table in the Northwind sample database: OrderDetailIDOrderIDProductIDQuantity ...
"case when" in sql "then 1 else 0 end as" <-- what does this syntax mean? Posted 10-26-2017 08:57 PM (9141 views) The below was prefaced by %let startdate = '01JAN1999'd; %let elig_2010 = '31DEC2010'd; ... Question 1 of 2: For above, why is ...
case when score < 60 then 60 else '优秀' end from stuent 1. 2. 3. 4. 5. 但是运行的时候报错了:ERROR: invalid input syntax for type numeric:'优秀' 百度说:数据类型不符。 仔细想一下, 60是int,优秀是string,确实类型不符。
SQL CASE Syntax SELECT column1, column2,... , CASE WHEN condition THEN result END AS alias_name FROM table; Here, column1,column2, ... are the column names to be included in the result set CASE checks the condition result is the result or value to be inserted to the new column if...
syntaxsql CASEWHENwhen_expressionTHENresult_expression[ ...n ] [ELSEelse_result_expression]END 引數 input_expression 這是使用簡單的CASE格式時,所評估的運算式。input_expression是任何有效的運算式。 WHENwhen_expression 這是使用簡單的CASE格式時,要與input_expression進行比較的簡單運算式。when_expression是任...
SQL注入是web安全中最常见的攻击方式,SQL注入有很多方法,但如果只知道payload,不知道原理,感觉也很难掌握,这次就总结一下我所遇到的SQL注入方法,原理分析+题目实战。 0x00 Xpath报错注入 涉及函数 updatexml():对xml进行查询和修改 extractvalue():对xml进行查询和修改 ...