orden de límite de SQL por
-- MySql
SELECT * FROM emp ORDER BY sal DESC LIMIT 5;
-- SQL Server
SELECT TOP 5 * FROM emp ORDER BY sal DESC;
-- Oracle < 11g
SELECT * FROM ( SELECT * FROM emp ORDER BY sal DESC ) WHERE ROWNUM <= 5;
-- Oracle 12c +
SELECT * FROM emp ORDER BY sal DESC FETCH FIRST 5 ROWS ONLY;
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