*@paramreasonable 分页合理化,null时用默认配置 *@parampageSizeZero true且pageSize=0时返回全部结果,false时分页,null时用默认配置 */publicstatic<E>Page<E>startPage(int pageNum, int pageSize,booleancount,Booleanreasonable,BooleanpageSizeZero) {Page<E> page =newPage<E>(pageNum, pageSize, count);...
SELECT message_id AS Error, severity AS Severity, [Event Logged] = CASE is_event_logged WHEN 0 THEN 'No' ELSE 'Yes' END, [text] AS [Description] FROM sys.messages WHERE language_id = 1040 /* replace 1040 with the desired language ID, such as 1033 ...
limit 0, 10]; Column 'created_by' in where clause is ambiguous; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'created_by' in where clause is ambiguous 原因: 说明SQL语句中有重复的created_by功能调用,并且在Mapper文件中,多表关联查询中有相同的...
如果子群組是空的,SQL Server 會為該 output_column 產生null 值。 如果彙總函式是 COUNT,且子群組是空的,就會傳回零 (0)。注意 UNPIVOT 子句中的資料行識別碼會依照目錄定序。 SQL Database 的定序一律為 SQL_Latin1_General_CP1_CI_AS。 SQL Server 部分自主資料庫的定序一律為 Latin1_General_100_CI...
-- because 'sysadmin' includes the 'CONTROL SERVER' permission.SELECT'Owner-is-Role', prin.name,-- [Role-Name]CAST((IsNull(pri2.name, N'No members'))ASNVARCHAR(128)),NULLFROMsys.server_role_membersASrolmRIGHTJOINsys.server_principalsASprinONprin.principal_id = rolm....
[Type-of-Item], p.nameAS[Package], o.nameAS[Item], o.descriptionAS[Item-Description]FROMsys.dm_xe_objectsASoJOINsys.dm_xe_packagesASpONo.package_guid = p.guidWHEREo.object_typeIN('action','target','pred_source')AND( (o.capabilities &1) =0ORo.capabilitiesISNULL)ORDERBY[Type-of-...
如果字符串为空字符串或者NULL,返回true。否则,返回false. 代码语言:javascript 代码运行次数:0 复制Cloud Studio 代码运行 mysql -> case when then end doris -> NULL_OR_EMPTY (VARCHAR str) 将字符串反转,返回的字符串的顺序和源字符串的顺序相反. ...
在某些情况下,你可能希望在将条件应用于整个组(使用HAVING子句)之前,从组(使用WHERE子句)中排除单个行。 HAVING子句类似于WHERE子句,但仅适用于整个组(即表示组的结果集中的行),而WHERE子句适用于各个行。 查询可以同时包含WHERE子句和HAVING子句。 在这种情况下: ...
WHERECountry='Mexico'; Try it Yourself » Syntax SELECTcolumn1,column2, ... FROMtable_name WHEREcondition; Note:TheWHEREclause is not only used inSELECTstatements, it is also used inUPDATE,DELETE, etc.! Demo Database Below is a selection from theCustomerstable used in the examples: ...
SQL IN 操作符 IN 操作符 IN 操作符允许您在 WHERE 子句中规定多个值。 SQL IN 语法 SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,...); 1. 2. 3. 演示数据库 在本教程中,我们将使用 RUNOOB 样本数据库。