DateTime.MinValue : uld.ATime 以上LINQ语句转换成SQL语句如下: CASEWHEN(uld.ATIMEISNULL)THENGETDATE()ELSEuld.ADTIMEENDASATIME, 例子二: IsDisabled=ul.IsDisabled||l.IsDisabled 以上LINQ语句转换成SQL语句如下: CASEWHEN([ul].[IsDisabled]=1OR[l].[IsDisabled]=1)THENcast(1asbit)WHEN(NOT([ul].[...
The key to using simple CASE statements effectively is understanding how to compare an expression to fixed values.The expression in a simple CASE statement can be a column name, a function, or any valid SQL expression. The values in the WHEN clauses are the fixed values against which we wan...
We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSELECTcustomer_id, first_name,CASEWHENcountry ='USA'THEN'United States of America'WHENcountry ='UK'THEN'United Kingdom'ENDAScountry_nameFROMCustomers; Run Code Here, the...
PreparedStatement 是Java编程语言中的一个接口,用于执行预编译的SQL语句。它继承自 Statement 接口,允许在执行SQL查询之前将参数添加到SQL语句中。...此外,它允许参数化查询,即将动态值作为参数传递到SQL语句中,防止了SQL注入攻击的风险。...防止 SQL 注入攻击: 通过参数化查询,PreparedStatement 允许将参数传递到 SQL...
Summary: in this tutorial, you will learn how to use the PL/SQL CASE statement to control the flow of a program. The CASE statement chooses one sequence of statements to execute out of many possible sequences. The CASE statement has two types: simple CASE statement and searched CASE stateme...
SQL---CASE WHEN条件表达式(conditional statement) 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。)...
'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. "EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have the same exposed names. Use correlation names to distingui...
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] [ELSE else_result_expression] END Search Case Statement CASE WHEN ...
我想使用CASE语句根据某些条件选择输入的数据SQL中的CASE WHEN使用 Case具有两种格式。简单Case函数和Case...
SQL SELECTBusinessEntityID, LastName, TerritoryName, CountryRegionNameFROMSales.vSalesPersonWHERETerritoryNameISNOTNULLORDERBYCASECountryRegionNameWHEN'United States'THENTerritoryNameELSECountryRegionNameEND; GO D. Use CASE in an UPDATE statement