sql的limit函数如何写

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筋斗云
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在SQL中,LIMIT函数的用法取决于你使用的数据库管理系统(DBMS),例如MySQL、PostgreSQL、SQLite等。以下是几种常见DBMS中LIMIT函数的用法:

  1. MySQL和SQLite:
SELECT column1, column2, ... FROM table_name [ORDER BY column1, column2, ...] LIMIT number_of_rows; 

例如,要查询employees表的前10条记录,你可以这样写:

SELECT * FROM employees LIMIT 10; 
  1. PostgreSQL:
SELECT column1, column2, ... FROM table_name [ORDER BY column1, column2, ...] LIMIT number_of_rows OFFSET offset_value; 

例如,要查询employees表的第11条到第20条记录,你可以这样写:

SELECT * FROM employees LIMIT 10 OFFSET 10; 
  1. SQL Server:
SELECT TOP number_of_rows column1, column2, ... FROM table_name [ORDER BY column1, column2, ...]; 

例如,要查询employees表的前10条记录,你可以这样写:

SELECT TOP 10 * FROM employees; 
  1. Oracle:
SELECT column1, column2, ... FROM (SELECT column1, column2, ...       FROM table_name       [ORDER BY column1, column2, ...]) WHERE ROWNUM <= number_of_rows; 

例如,要查询employees表的前10条记录,你可以这样写:

SELECT * FROM (   SELECT * FROM employees   ORDER BY employee_id ) WHERE ROWNUM <= 10; 

请根据你使用的DBMS选择合适的LIMIT函数用法。

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