selectcriteria选择条件。 如果语句中包含WHERE子句,则 Microsoft Access 数据库引擎将会在对记录应用 WHERE 条件后,对值进行排序。 field1、field2排序记录所依据的字段的名称。 备注 ORDER BY 是可选的。 但是,如果希望按排序后的顺序显示数据,那么必须使用 ORDER BY。
指定FROM 子句所列出的表中的哪些记录会受 SELECT、UPDATE 或DELETE 语句的影响。语法SELECT fieldlist FROM tableexpression WHERE criteria包含WHERE 子句的 SELECT 语句具有以下部分:展开表 Part说明 fieldlist 任何要检索的字段的名称,以及任何字段名别名、选择谓词(ALL、DISTINCT、DISTINCTROW 或 TOP)或其他 SELECT ...
Create a query that compares fields by using one field as a criterion for the other. Using a field as a criterion for another field is generally slower than using joins, because joins eliminate rows from a query's results before the underlying tables are read, wherea...
Limit results by using criteria When you want to use data to limit the number of records that are returned in a query, you can use criteria. A query criterion is similar to a formula — it is a string that may consist of field references, operators, and constants. Query criteria are a...
Query Types Basic Select Queries Setting Criteria Advanced Select Queries Using Parameters Using Access Functions Using Custom Functions Other Advanced Queries Percent of Total Frequency Distribution Union Queries to Combine Queries Action Queries Using Queries in Forms, Reports, and Macros ...
criteriaAn expression that records must satisfy to be included in the query results. Remarks The 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...
QUERY 3072 <Visual Basic error string>. EXTENDED 3073 Operation must use an updateable query. QUERY 3074 Can't repeat table name <name> in FROM clause. EXTENDED 3075 <Message> in query expression <expression>. EXTENDED 3076 <Message> in criteria expression. EXTENDED 3077 <Me...
("porStock",20); // 通过OR连接查询条件1--criteria1和查询条件2--criteria2 // porschExample就相当于select 字段名 from 表明 WHERE criteria 1 // 只需要调用or方法将criteria2连接上,就构成了完成的SQL语句 // select 字段名 from 表明 WHERE (criteria1) OR (criteria2) porscheExample.or(criteria2...
in the Criteria row under MusicType. Select Parameters from the Query menu to open the Query Parameters dialog, where you declare the parameter. For this example, enter: Type of Music? in the Parameter column of the Query Parameters dialog, and choose: Text from the data type combo box to...
The most basic Select queries retrieve the records you specify from a table. You can choose the fields from a table to display, and specify the criteria for selecting records. In the most cases, while viewing the query results you can modify the data and update the original records. These ...