IS [NOT] DISTINCT FROM 是一個述詞,可在WHERE子句和HAVING子句的搜尋條件中、FROM子句的聯結條件中,以及其他需要布林值的建構中使用。 Transact-SQL 語法慣例 語法 syntaxsql expressionIS[NOT]DISTINCTFROMexpression 引數 expression 任何有效的運算式。
IS [NOT] DISTINCT FROM谓词是比较两个表达式的便捷方式,即使在涉及NULL值时也能确保结果为 true 或 false。 谓词用于WHERE和HAVING子句的搜索条件中,还用于FROM子句的联接条件以及需要布尔值的其他构造中。 在SQL Server 中使用NULL值可能具有挑战性,因为比较它们会导致结果未知。IS DISTINCT FROM / IS...
1920distinct可选,指显示结果时,是否剔除重复数据21222324简单的查询语句25262728■ 查询所有列2930select*from表名;3132■ 查询指定列3334select列1,列2…from表名;3536selectename,salfromemp;3738■ 如何取消重复行3940selectdistinctdeptno ,jobfromemp;4142?查询SMITH 的薪水,工作,所在部门4344selectsal,job,deptnofro...
1920distinct可选,指显示结果时,是否剔除重复数据21222324简单的查询语句25262728■ 查询所有列2930select*from表名;3132■ 查询指定列3334select列1,列2…from表名;3536selectename,salfromemp;3738■ 如何取消重复行3940selectdistinctdeptno ,jobfromemp;4142?查询SMITH 的薪水,工作,所在部门4344selectsal,job,deptnofro...
Automation process to set up Azure AD administrator for SQL Server Ledger - automatic digest upload to Azure Storage 3 additional fixed server-level roles added Language APPROX_PERCENTILE_DISC() APPROX_PERCENTILE_CONT() DATETRUNC() IS [NOT] DISTINCT FROM ...
For Hyperscale SLA, see SLA for Azure SQL Database. Buffer pool, resilient buffer pool extension, and continuous priming In Azure Database Hyperscale, there is a distinct separation between compute and storage. Storage contains all the database pages in one database, and can be allocated over ...
DistinctPredicate DropAggregateStatement DropAlterFullTextIndexAction DropApplicationRoleStatement DropAssemblyStatement DropAsymmetricKeyStatement DropAvailabilityGroupStatement DropBrokerPriorityStatement DropCertificateStatement DropChildObjectsStatement DropClusteredConstraintMoveOption DropClusteredConstraintOption DropClu...
it's possible to create a second capture instance for the table that reflects the new column structure. This option allows the capture process to make changes to the same source table into two distinct change tables having two different column structures. Thus, while one change table can continu...
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it's possible to create a second capture instance for the table that reflects the new column structure. This option allows the capture process to make changes to the same source table into two distinct change tables having two different column structures. Thus, while one change table can continu...