This SQL tutorial explains how to use the SQL WHERE clause with syntax and examples. The SQL WHERE clause is used to filter the results and apply conditions in a SELECT, INSERT, UPDATE, or DELETE statement.
The sections that follow describe the various forms of conditions. You must use appropriate condition syntax wheneverconditionappears in SQL statements. You can use a condition in theWHEREclause of these statements: DELETE SELECT UPDATE You can use a condition in any of these clauses of theSELECT...
The SQL WHERE clause sets a filter condition for a SQL statement. It extracts only the rows that meet the specified conditions, like retrieving all customers located in a specific area. In this SQL tutorial, we will illustrate the different use cases and options available when using the WHERE ...
TheWHEREclause is used with theSELECT,UPDATE, andDELETE. However, you'll see the use of this clause with other statements in upcoming chapters. Syntax TheWHEREclause is used with theSELECTstatement to extract only those records that fulfill specified conditions. The basic syntax can be given wit...
WHERE last_name = 'Johnson' OR first_name = 'Danielle'; This SQL Server WHERE clause example uses the WHERE clause to define multiple conditions, but instead of using theAND condition, it uses theOR condition. In this case, this SELECT statement would return allemployee_id,last_name, andfi...
The following operators can be used in the WHERE clause:OperatorDescriptionExample = Equal Try it > Greater than Try it < Less than Try it >= Greater than or equal Try it <= Less than or equal Try it <> Not equal. Note: In some versions of SQL this operator may be written as !=...
In SQL Server, the SELECT statement can have an optional WHERE clause to filter the data. The WHERE clause can include one or more boolean conditions to filter out data of the tables. The WHERE clause always comes after the FROM clause and before GROUP BY, HAVING, and ORDER BY clauses....
What You Cannot Use in a WHERE Clause You cannot use aggregate functions directly in a WHERE clause. This is because the conditions in a WHERE clause are evaluated row by row, whereas aggregate functions work on multiple rows to return a single result. Consider this example. You want to ret...
Question: In SQL, conditions after the WHERE clause require single quotes around values if the values have which data type?CharVarcharIntegerNumericBoth Char and Varchar conditions after the WHERE clause require single quotes around values if the ...
Understand how to filter data in SQL queries using the WHERE clause. Learn to apply conditions to refine your SQL SELECT statements.