This SQL Server tutorial explains how to use the SQL Server (Transact-SQL) CASE statement with syntax and examples. In SQL Server (Transact-SQL), the CASE statement has the functionality of an IF-THEN-ELSE statement. You can use the CASE statement within
處理單一 Transact-SQL 陳述式是 SQL Server 執行 Transact-SQL 陳述式的最基本方式。 用於處理僅參考本機基底資料表 (非檢視表或遠端資料表) 之單一 SELECT 陳述式的步驟可說明這個基本程序。邏輯運算子優先順序當陳述式中使用一個以上的邏輯運算子,NOT 會第一個計算,接下來是 AND,最後才是 OR。 先處理算術...
The SQLCASEstatement evaluates a list of conditions and adds a column with values based on the condition. For example, -- add a new column 'order_volume' in the Orders table-- and flag any order greater than 10000 as 'Large Order'-- and smaller than 10000 as 'Small Order'SELECT*,CASE...
SQL Server allows for only 10 levels of nesting inCASEexpressions. TheCASEexpression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, seeControl-of-Flow Language (...
head.statement_end_offset , head.plan_handle, head.sql_handle, head.most_recent_sql_handle, 0 AS [Level] FROM cteHead AS head WHERE (head.blocking_session_id IS NULL OR head.blocking_session_id = 0) AND head.session_id IN (SELECT DISTINCT blocking_session_id FROM cteHead WHERE blockin...
blocked.wait_time, blocked.wait_resource, h.statement_start_offset, h.statement_end_offset, h.plan_handle, h.sql_handle, h.most_recent_sql_handle, [Level] +1FROMcteHeadASblockedINNERJOINcteBlockingHierarchyAShONh.session_id = blocked.blocking_session_idandh.session_id!=blocked.session_id--...
如果短时间内不停连接,就会被SQL SERVER误认为是这是攻击,会将此账号锁定。 要用windows身份验证登录,在查询分析器里输入: ALTER LOGIN sa ENABLE ; GO ALTER LOGIN sa WITH PASSWORD = 'password' unlock, check_policy = off, check_expiration = off ; ...
第一步,使用SQL SERVER提供图形界面工具观察哪些进程被加锁。 1 ) SQL SERVER 2005可以通过Microsoft SQL Server Management Studio的“管理--》活动监视器”--》“右键”--》“进程信息”,这里呈现连接、锁定的各种细节。如下图1。 图1 2) SQL SERVER 2005 的Microsoft SQL Server Management Studio提供图形界面...
例如,如果 SSMS 的对象资源管理器显示未定义任何事件会话,则针对视图sys.server_event_session_targets的 SELECT 语句将不返回任何行。 名称前缀为: sys.server_event_session*是 SQL Server 上的名称前缀。 sys.database_event_session*是 SQL 数据库上的名称前缀。
SELECT [Spid] = session_Id ,ecid ,[Database] = DB_NAME(sp.dbid) ,[User] = nt_username ,[Status] = er.STATUS ,[Wait] = wait_type ,[Individual Query] = SUBSTRING(qt.TEXT, er.statement_start_offset / 2, ( CASE WHEN er.statement_end_offset = - 1 THEN LEN(CONVERT(NVARCHAR(MAX...