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It is not possible to test for NULL values with comparison operators, such as =, <, or <>. We will have to use theIS NULLandIS NOT NULLoperators instead. IS NULL Syntax SELECTcolumn_names FROMtable_name WHEREcolumn_nameISNULL;
We can replace NULL values with a specific value using the SQL Server ISNULL Function. The syntax for the SQL ISNULL function is as follow. 我们可以使用SQL Server ISNULL函数将NULL值替换为特定值。 SQL ISNULL函数的语法如下。 SQL Server ISNULL (expression, replacement) SQL Server ISNULL(表达式...
经过这三次的试验结果:猜测isnull返回的结果类型,与第一个变量是息息相关的,甚至就取决于第一个变量的类型。 官方解释: Syntax ISNULL(check_expression,replacement_value) Arguments check_expression Is the expression to be checked for NULL.check_expressioncan be of any type. replacement_value Is the exp...
Syntax syntaxsqlCopy ISNULL(check_expression,replacement_value) Arguments check_expression Theexpressionto be checked forNULL.check_expressioncan be of any type. replacement_value The expression to be returned ifcheck_expressionisNULL.replacement_valuemust be of a type that is implicitly convertible to...
根据X/Open和SQL Access Group SQL CAE规范(1992)所进行的定义,SQLERROR返回SQLSTATE值。SQLSTATE值是包含五个字符的字符串,由2个字符的SQL错误类和3个字符的子类构成。五个字符包含数值或者大写字母, 代表各种错误或者警告条件的代码。成功的状态是由00000标识的。SQL
-- Set the options to support indexed views SET NUMERIC_ROUNDABORT OFF; SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLS ON; GO -- Create view with schemabinding IF OBJECT_ID ('Sales.vOrders', 'view') IS NOT NULL DROP VIEW Sales.vOrders...
syntaxsql复制 <query_hint>::={ {HASH|ORDER}GROUP| {CONCAT|HASH|MERGE}UNION| {LOOP|MERGE|HASH}JOIN|DISABLE_OPTIMIZED_PLAN_FORCING|EXPANDVIEWS|FAST<integer_value>|FORCEORDER| {FORCE|DISABLE}EXTERNALPUSHDOWN| {FORCE|DISABLE}SCALEOUTEXECUTION|IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX|KEEPPLAN|KEEP...
syntaxsql BULKINSERT{database_name.schema_name.table_or_view_name|schema_name.table_or_view_name|table_or_view_name}FROM'data_file'[WITH( [ [ , ]DATA_SOURCE='data_source_name']-- text formatting options[ [ , ]CODEPAGE= {'RAW'|'code_page'|'ACP'|'OEM'} ] [ [ , ]DATAFILETYPE...
通过指定FOR BROWSE在浏览模式游标中查看查询结果时允许更新。 通过指定FOR XML将查询结果格式化为 XML。 通过指定FOR JSON将查询结果格式化为 JSON。 Transact-SQL 语法约定 语法 syntaxsql复制 [FOR{BROWSE|<XML>|<JSON>} ]<XML>::=XML{ {RAW[ ('ElementName') ] |AUTO} [<CommonDirectivesForXML>[ , {...