</isNotNull> 即使你在bean中不设置id的值，id的初始值也是0而不是null;所以这样配置a.id会等于0 而你把name变量用isNotNull这样配置，name如果不设置值，初始就是null,name的条件不就添加在sql中；isEqual相当于equals，数字用得多些，一般都是判断状态值 <isEqual property="state"compareValue="...
Null values selected within a statement that is using distinct will be considered equal when evaluating the distinct aspect of the query It is possible in SQL Server to override the expression logic regarding the specific Null = Null test, using the SET ANSI_NULLS OFF, which will then give yo...
But in SQL, NULL has been given two roles (at least) - to mark inapplicable information (maybe we have complete information in the database, and Chris and Tony didn't turn up for work that day, or did but weren't wearing trousers), and to mark missing information (Chris did turn up...
we passed two NULL values and still received TRUE because, as mentioned above, this function treats NULLs as equal. In SQL Server, we can implement the logic of EQUAL_NULL in the
<isEqualprepend="and"property="FCOMLVL"compareValue="-1">FCOMLVL IS NULL</isEqual> 1.2.2 字段等于具体的值:column!="value" 语法: <isNotEqual prepend="" property="" compareValue=""></isNotEqual> 举例: <isNotEqualprepend="and"property="FPLVCODE"compareValue="1">FPLVCODE=#FPLVCODE#</is...
All MonthNames and Month numbers in sql server All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists. all the events in the workload were ignored due to syntax errors.the most common reason for the error would be ...
<=: tests whether the first value is less than or equal to the second >=: tests whether the first value is greater than or equal to the second Null: Predicates that use theIS NULLoperator test whether values in a given column are NullRange: Range predicates use theBETWEENoperator to test...
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intoacolumn,use\Ninthe datafile. The literal word “NULL” may also be used undersomecircumstances. See Section13.2.6, “LOADDATA INFILE Syntax”.WhenusingDISTINCT,GROUPBY,orORDERBY,allNULLvaluesare regardedasequal.WhenusingORDERBY,NULLvaluesare presented first,orlastifyou specifyDESCtosortin...