Sql Select Distinct Clause

• The Select Distinct  Clause is used to get different records.
• If we have dublicate records,only one of them is listed.
• The values of all listed columns must be exactly the same.
• For to bring records faster,at the subqueries are used often.

Sql Select Distinct Syntax

Select distinct columnNames from tableName

Sql Select Distinct Examples on Library Database

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Example 1: List all students name,but the same names are listed ones.

Select distinct name from students

Example 2: List all students class names,but the same class names are listed ones.

Select distinct class from students

Example 3: List the books, that the student named John has read. The same records are listed ones.

Select distinct books.* from books join borrows on books.bookId = borrows.bookId join students on borrows.studentId = students.studentId

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