An expression in a WHERE clause names or specifies something that you want to compare to something else. The expressions you specify can be: Acolumn namenames a column. For example: ...WHEREEMPNO = '000200' EMPNOnames a column that is defined as a 6-byte character value. Anexpressionident...
Side note:Be aware that the above approach may lead to performance issues. The SQL Server query ...
复制 java.sql.SQLSyntaxErrorException:Unknown column'XXX'in'where clause'at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)~[mysql-connector-java-8.0.20.jar:8.0.20]at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)~[mysql-connector-java-8.0....
This is basically the same as writing a CASE expression in that it will not use an index on our column and doesn't implement solid boolean logic. Converting that IF to a simple boolean expression results in a nice WHERE clause of: WHERE (@CustID is null OR CustID = @CustID) which, ag...
Conditional expressionA conditional expression chooses an expression to evaluate based on a boolean test. Boolean expressions Boolean expressions are expressions that result in boolean values. Most general expressions can result in boolean values. Boolean expressions commonly used in a WHERE clause are mad...
aThe expression specified with the WhereClause property is a SQL query. The syntax of the query differs depending on the data source you are using, as it is in the native format of the database or data source. An application can use the ISQLSyntax interface on a Workspace to determine in...
SQL WHERE IN Clause with an Array Often, you will need to retrieve data based on two or more values. In this section, we will show, by example, how to filter based on the values in an “array or expression list.” On a side note:I used the term “array” throughout this article...
使用WhereClause 属性指定的表达式是一个 SQL 查询。 翻译结果3复制译文编辑译文朗读译文返回顶部 使用WhereClause 属性指定的表达式是一个 SQL 查询。 翻译结果4复制译文编辑译文朗读译文返回顶部 与该指明的词句whereclause财产是SQL查询。 翻译结果5复制译文编辑译文朗读译文返回顶部 ...
第三类、条件子句(Clause) 在SQL的查询中,利用一些表达式定义出查询的条件,以缩小寻找的范围,如WHERE。 第四类、运算符(Operator)与操作数(Operation) 在SQL的查询中,与Operation共同组成表达式(Expression),如BETWEEN...AND 运算符与INNER JOIN操作数。 第...
criteria An expression that records must satisfy to be included in the query results.RemarksThe Microsoft Access database engine selects the records that meet the conditions listed in the WHERE clause. If you do not specify a WHERE clause, your query returns all rows from the table. If you ...