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To limit the number of rows returned in a MS SQL query you need to use the TOP command. This goes before you name the columns that are to be returned by the SELECT statement.

The following query returns the first 35 rows from a table.

SELECT TOP 35 * FROM table WHERE value > 4 ORDER BY id DESC

To get a random row from a PostgreSQL database you need to use the RANDOM() function. This is similar to the MySQL function RAND() and will generate a new random number for each row and order them by that new number. This is used in conjunction with the LIMIT clause to limit the amount of returned rows to one.

SELECT value FROM table ORDER BY RANDOM() LIMIT 1

Getting a random row from a MySQL table requires the use of the RAND() function in the ORDER BY clause of the SELECT statement. This will generate a new random number for each row and order them by that new number. In order to get a single row this is combined with the LIMIT clause to limit the result to a single row.

SELECT * FROM theTable ORDER BY RAND() LIMIT 1;