【SQL TOP子句】用于规定要返回的记录的数目。
SQL Server的语法:select top number |percent column_name(s) from table_name
MYSQL语法:select column_name(s) FROM table_name LIMIT number 例子:select * from Persons LIMIT 5
Oracle语法 :SELECT column_name(s) FROM table_name WHERE ROWNUM<= number 例子:SELECT * FROM Persons WHERE ROWNUM<=5
【SQL LIKE 操作符】用于在where子句中搜索列中的指定形式。