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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. For an overview of Access SQL, see the article Access SQL: basic concepts, vocabulary, and syntax.
Podstawowe klauzule języka SQL: SELECT, FROM i WHERE. Sortowanie wyników: klauzula ORDER BY. Praca z podsumowanymi danymi: klauzule GROUP BY i HAVING. Łączenie wyników zapytań: operator UNION. Co to jest język SQL? SQL to język komputerowy przeznaczony do pracy ze zbiorami faktów i relacjami między nimi.
W tym artykule opisano korzystanie z klauzuli WHERE w bazach danych programu Access.
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: SQL. Copy. SELECT LastName, Salary . FROM Employees . WHERE Salary > 21000;
25 maj 2017 · I have a 'Flags' table that contains 3 entries: (1, SourceA) (2, SourceB) (3, Both) 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 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.
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;
