MySQLCASEFunction ❮Previous❮ MySQL FunctionsNext❯ ExampleGet your own SQL Server Go through conditions and return a value when the first condition is met: SELECTOrderID, Quantity, CASE WHENQuantity >30THEN"The quantity is greater than 30" ...
mysqlcase多个关键字使用and或者in 在MySQL中，可以使用AND关键字将多个关键字组合在一起并进行逻辑与运算。这意味着只有当所有关键字都满足条件时，才会返回结果。示例使用AND关键字：```sql SELECT * FROM table_name WHERE column1 = value1 AND column2 = value2 AND column3 = value3;```此查询将返回...
果然,用了SUM函数之后,SQL语句变简单了,效率也大大提高了! SELECTdate,SUM(caseresultwhen'win'then1else0end)ASwin,SUM(caseresultwhen'lose'then1else0end)ASloseFROMinfoGROUPBYdateORDERBYdate; 测试完了,删除测试表: DROPTABLEinfo; 参考资料: http://www.yiibai.com/mysql/case-function.html http://www...
Description:When using built-in functions (i.e. get_lock) the digest hashing depends on the case used in the function. This makes it much harder to use a query rewrite rule, since there needs to be one-rule per case.How to repeat:The last select returns 2 rows. Ideally it should ret...
MySQL 存储过程——流程控制 顺序结构:程序从上往下依次执行 分支结构:程序从两条或者多条路径中选择一条去执行 循环结构: 程序在满足一定条件的基础上,重复执行一段代码 一、分支结构 1.if函数 功能:实现简单的分支 语法: select iF(表达式1,表达式2,表达式3) ...
Member Function Documentation◆ add_json_info()void Item_func_case::add_json_info ( Json_object * json_obj ) inlineoverrideprotectedvirtual Add all the node-specific json fields. Any class that needs to add such info should override this function rather than doing it in do_contextualize(...
Description This task is a part of Sun Globalization Requirements. MySQL provides only partial support for case conversion in Asian CJK (Chinese Japanese Korean) character sets. Functions UPPER(), UCASE(), LOWER(), LCASE() work only for the basic Latin letters: A-Z / a-z. They do not ...
GreatSQL是MySQL的国产分支版本,使用上与MySQL一致。 事件起因:在测试一个数据迁移工具时,源端oracle19c数据迁移到目标端mysql8.0,提示迁移目标端 Unknown database 'SBTEST',报错如下: 2022-07-2910:08:19,155ERROR com.greatsync.connector.jdbc.internal.ComplexJdbcOutputFormat[] -JDBCexecuteBatch error, retry ...
Re: CASE and common table expression in mysql Dmitriy Burtsev December 31, 2019 09:36AM Re: CASE and common table expression in mysql Peter Brawley December 31, 2019 10:29AM Sorry, you can't reply to this topic. It has been closed.Content...
IN EXISTS LIKE谓词 例:查询SC表中9开头的成绩信息 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECTsc.cno,sc.gradeFROMscWHEREgradeLIKE'9%'; %是表示“任意字符串”的通配符。 _是表示“任意1个字符”的通配符 BETWEEN谓词 代码语言:javascript ...