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This article describes how to write a WHERE clause, and uses examples to illustrate various techniques that you can use in a WHERE clause. In a SQL statement, the WHERE clause specifies criteria that field values must meet for the records that contain the values to be included in the query results.
The SQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition. Example. Select all customers from Mexico: SELECT * FROM Customers WHERE Country='Mexico'; Try it Yourself » Syntax. SELECT column1, column2, ... FROM table_name WHERE condition;
Use the WHERE clause to eliminate records you do not want grouped by a GROUP BY clause. Use various expressions to determine which records the SQL statement returns. For example, the following SQL statement selects all employees whose salaries are more than $21,000: SELECT LastName, Salary FROM Employees WHERE Salary > 21000;
21 sty 2022 · Use the WHERE clause to eliminate records you don't want grouped by a GROUP BY clause. Use various expressions to determine which records the SQL statement returns. For example, the following SQL statement selects all employees whose salaries are more than $21,000:
25 maj 2017 · I want to create a WHERE clause to limit the results of the query to only records where TableA.Flag is equal to TableB.Flag or TableA has a flag of BOTH and TableB has a flag of SourceA. In other SQL languages, this could be accomplished easily by grouping the where condition logic like so:
The following illustrates what a SQL statement for a simple select query might look like in Access: 1. SELECT clause. 2. FROM clause. 3. WHERE clause. This example SQL statement reads "Select the data that is stored in the fields named E-mail Address and Company from the table named Contacts, specifically those records in which the value of the ...
In order to write effective Microsoft Access queries, you'll need to master the SQL WHERE clause. Simply put, the WHERE clause allows you to limit the results of your query based on conditions that you apply.
