1.分页
Oracle:
SELECT * FROM(SELECT A.*, ROWNUM RN FROM (select T.* from sj_receiptinfo t WHERE t.TAXNO LIKE CONCAT(‘%‘, CONCAT(?, ‘%‘)) order by t.id desc) A WHERE ROWNUM <= ?)WHERE RN > ?
mysql:
select * from tableName where 条件 limit (当前页码*页面容量-1) , 页面容量pagesize
sqlServer:
SELECT w2.n, w1.* FROM ARTICLE w1,( SELECT TOP 1030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE) w2 WHERE w1.ID = w2.ID AND w2.n > 1000 ORDER BY w2.n ASC
postgresql:select * from xxx limit pagesize
offset offsetNum ;
pagesize是固定的,即每页显示多少记录。offsetNum=(当前页数-1)*pagesize
2.查询头5条记录
Oracle:
SELECT * FROM
PersonsWHERE ROWNUM <= 5
mysql: SELECT * FROM Persons LIMIT 5
sqlServer: SELECTTOP 2
* FROM Personspostgresql:SELECT * FROM Persons LIMIT 5;跟mysql一样3.模糊查询Oracle:select T.* from sj_receiptinfo t WHERE t.TAXNO LIKE CONCAT(‘%‘, CONCAT(?, ‘%‘))mysql:select T.* from sj_receiptinfo t WHERE t.TAXNO LIKE CONCAT(‘%‘, ?, ‘%‘)
sqlServer:select T.* from sj_receiptinfo t WHERE t.TAXNO LIKE ‘%%’postgresql:select *,( T .类别代码 || ‘-‘ || T .发票号码 ) AS 号码 from account where username ~* ‘baidu‘;找出数据表account中所有用户名包含baidu且不区分大小写的用户的信息4.判断nullOracle:SELECT ProductName,UnitPrice*(UnitsInStock+NVL(UnitsOnOrder,0))FROM Productsmysql:SELECT ProductName,UnitPrice*(UnitsInStock+IFNULL(UnitsOnOrder,0))FROM ProductssqlServer:SELECT ProductName,UnitPrice*(UnitsInStock+ISNULL(UnitsOnOrder,0))FROM Productspostgresql:SELECT ProductName,UnitPrice*(UnitsInStock+COALESCE(UnitsOnOrder,0))FROM Products5.插入数据Oracle:insert into company(id,name,parentid,ccdm) values(COMPANY_SEQ.NEXTVAL,?,?,?)序列mysql:insert into person(fullName,companyName) values(?,?) 因为ID是自动增长auto_increment6.查询最大idOracle:SELECT NVL(MAX(ID),0)+1 FROM REPOT_BS
时间: 2024-10-09 15:00:49