1 1、查找目前SQL Server所执行的SQL语法,并展示资源情况: 33 SELECT s2.dbid , 34 DB_NAME(s2.dbid) AS [数据库名] , 35 --s1.sql_handle , 36 ( SELECT TOP 1 37 SUBSTRING(s2.text, statement_start_offset / 2 + 1, 38 ( ( CASE WHEN statement_end_offset = -1 39 THEN ( LEN(CONVERT...
CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。) (注:when子句一定要有排他性,因为当when子句为真时,剩余的when子句会被忽略。) CASE表达式的用途: 1,转换...
execution_count, (SELECT SUBSTRING(text, statement_start_offset/2 + 1, (CASE WHEN statement_end_offset = -1 THEN LEN(CONVERT(nvarchar(max), text)) * 2 ELSE statement_end_offset END - statement_start_offset)/2) FROM sys.dm_exec_sql_text(sql_handle)) AS query_text FROM sys.dm_exec_...
允许您有条件地从多次比较中返回特定值。 有两种类型的 Case 语句: 简单Case 语句将某个表达式与一组简单表达式进行比较,以返回特定的值。 搜索Case 语句计算一组布尔表达式,以返回特定的值。 语法 Simple Case Statement CASE [input_expression] WHEN when_expression THEN when_true_result_expression [...n] ...
所以这是我的主要问题,我有一个基于经理定义团队的case语句,它看起来像这样: when manager = 'manager1' then 'team1'teamN'end"proj" = case 浏览2提问于2013-03-06得票数 1 回答已采纳 2回答 Server 2008中的多个字段签入case语句 、、 Case语句语法(MySQL):- WHEN search_condition THEN statement_lis...
CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING. ...
SQL Server 资源使用情况(CPU、内存、存储)和配置 查询性能较低 两个SQL Server 之间的不同查询性能 升级后的查询性能降低 查询使用优化嵌套循环时,可能导致高 CPU 使用或高内存授予。 启用常见条件符合性时性能下降 在新的 CE 连接包含假设下,性能下降。
SQL Server allows for only 10 levels of nesting in CASE expressions.The CASE expression 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, see Control-of-Flow ...
CASEmg.is_next_candidateWHEN1THEN'Yes'WHEN0THEN'No'ELSE'Memory has been granted'ENDAS'Next Candidate for Memory Grant', r.command ,ltrim(rtrim(replace(replace(substring(q.text,1,1000),char(10),' '),char(13),' '))) [text] , rs.target_memory_kb /1024ASserver_target_grant_memo...
SQL Server allows for only 10 levels of nesting in CASE expressions. The CASE expression 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, see Control-of-Flow Lan...