WHERE Filtering Clause

Function

This statement is used to filter the query results using the WHERE clause.

Syntax

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SELECT [ALL | DISTINCT] attr_expr_list FROM table_reference
  WHERE where_condition;

Keyword

• All is used to return repeated rows. By default, all repeated rows are returned. It is followed by asterisks (*) only. Otherwise, an error will occur.
• DISTINCT is used to remove the repeated line from the result.
• WHERE is used to filter out records that do not meet the condition and return records that meet the condition.

Precautions

The to-be-queried table must exist.

Example

To filter the records in which the scores are higher than 90 and lower than 95 in the student table, run the following statement:

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SELECT * FROM student
  WHERE score > 90 AND score < 95;