select case whenscore < 60then60 else'优秀'end fromstuent 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修改如下: 1 2 3 4 5 select case whenscore < 60then''|| 60 else'优秀'end fro...
–简单Case函数 CASE sex WHEN ‘1’ THEN ‘男’ WHEN ‘2’ THEN ‘女’ ELSE ‘其他’ END ...
ACASEstatement can have an optionalELSEclause. TheELSEclause is executed if none of the conditions in theCASEstatement is matched. Syntax SELECTcustomer_id, first_name,CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededELSEelse_resultENDASalias_nam...
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 when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
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。
在Entity Framework Core (EF Core)中,许多SQL语句的功能可以通过LINQ(Language Integrated Query)查询或EF Core特定的方法来实现。...虽然EF Core并不直接映射SQL函数到C#函数,但它提供了丰富的API来执行类似SQL中的操作,如聚合、筛选、排序、连接等。...下面是一些常用SQL操作及其在EF Core中的对应实现方式:SQL...
Here we introduce two new concepts: 1. object references as tables, and 2. individual column values being defined by the$syntax, instead of just tables. Object References as Tables The query table is defined with: FROM$1 And we bind the$1reference with: ...
6- 隐式连接语法 | Implicit Join Syntax 02:21 7- 外连接 | Outer Joins 06:28 8- 多表外连接 | Outer Join Between Multiple Tables 06:20 9- 自外连接 | Self Outer Joins 02:13 10- USING子句 | The USING Clause 05:24 11- 自然连接 | Natural Joins 01:22 12- 交叉连接 | Cross Joins ...
To left join query, using the syntax of the case after on (Similar example appeares in my own project) select * from AIRPORTORDER as A inner join RANGECODE as B on case when A.AIRPORDER_GOORBACK='2' then A.AIRPORDER_ENDCODE
ERRCODE_QUERY_CANCELED或者Query Is Cancelled 报错:ERROR: canceling statement due to statement timeout 问题原因:客户端设置了超时时间,Query运行时间超过了超时时间。 解决方法:优化Query使其运行时间更短,或者重新设置更加合理的超时时间。超时时间设置详情请参见Query管理。