5.18- SQL Select Top, LIMIT, Fetch First first, RowNum Clause | SQL Course | Microsoft Sql Server

5.18- SQL Select Top, LIMIT, Fetch First first, RowNum Clause | SQL Course | Microsoft Sql Server

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SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause

The SQL SELECT TOP Clause
The SELECT TOP clause is used to specify the number of records to return.

The SELECT TOP clause is useful on large tables with thousands of records. Returning a large number of records can impact performance.

Note: Not all database systems support the SELECT TOP clause. MySQL supports the LIMIT clause to select a limited number of records, while Oracle uses FETCH FIRST n ROWS ONLY and ROWNUM.

SQL Server / MS Access Syntax:

SELECT TOP number|percent column_name(s)
FROM table_name
WHERE condition;

SQL TOP, LIMIT and FETCH FIRST Examples
The following SQL statement selects the first three records from the "Customers" table (for SQL Server/MS Access):

Example
SELECT TOP 3 * FROM Customers;

SQL TOP PERCENT Example
The following SQL statement selects the first 50% of the records from the "Customers" table (for SQL Server/MS Access):

Example
SELECT TOP 50 PERCENT * FROM Customers;

ADD a WHERE CLAUSE
The following SQL statement selects the first three records from the "Customers" table, where the country is "Germany" (for SQL Server/MS Access):

Example
SELECT TOP 3 * FROM Customers
WHERE Country='Germany';


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