SELECT - SQL Command - Additional Display Options When you issue SET TALK ON and SET NOTIFY ON before executing SELECT, Visual FoxPro displays the length of time the query took to execute and the number of records in the results. _TALLY contains the number of records in the query results...
An expression that can be the name of a user-defined function.User-Defined Functions with SELECTAlthough using user-defined functions in the SELECT clause has obvious benefits, you should also consider the following restrictions:The speed of operations performed with SELECT might be limited by the ...
To reverse the value of a logical expression, use the NOT operator. To check for an empty field, use the EMPTY( ) function. The SELECT SQL command supports "<field> IS / IS NOT NULL" in the filter condition. To learn how to use the FilterCondition, see the Examples section. GROUP ...
The most commonly used SQL command is SELECT statement. SQL SELECT statement is used to query or retrieve data from a table in the database. A query may retrieve information from specified columns or from all of the columns in the table. To create a simple SQL SELECT Statement, you must ...
For the complete syntax, seeSELECT - SQL Command. The detailed syntax for theSELECTclause is as follows: Copy SELECT [ALL | DISTINCT] [TOP nExpr [PERCENT]] Select_List_Item [AS Column_Name] [, ...] Parameters [ALL | DISTINCT]
The following code shows a summary of the main clauses of the SELECT - SQL Command: Copy SELECT Select_List FROM Table_List ...[WITH (BUFFERING = lExpr)] [WHERE Conditions] [GROUP BY Column_List] [UNION Clause] [HAVING Conditions] [ORDER BY Column_List] [INTO Clause | TO Clause ...
For more information about a particular clause of the SQL SELECT command, see the following topics: You can create filter conditions that search for data containing SQL SELECT wildcard characters, such as percent (%) and underscore (_), by using the ESCAPE clause in the WHERE clause. In the...
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Aclause(子句)is a part of a SQL statement(Select语句的一个组成部分) ——for example,SELECT emplovee_id, last_name, and so on Astatement(语句)is a combination(组合)of two or more clauses(Select语句是两个或者多个子句的组合) ——for example,SELECT * FROM employees(SELECT *叫一个子句,FR...
SELECT - SQL Command - UNION Clause项目 2008/06/18 本文内容 Parameters Remarks See Also The UNION clause combines the results from two or more SQL SELECT statements into a single result set containing rows from all the queries in the UNION operation. 备注 When one of the columns is of ...