mysql和sqlserver的sql語句區別

1.查詢表結構數量等

mysql:
– 查看系統內所有數據庫
show databases；
– 查詢數據庫內所有表
show tables;
– 顯示錶結構
desc 表名;

sqlserver:
– 查看系統內所有數據庫
SELECT name, database_id, create_date FROM sys.databases ;
– 查詢數據庫內所有表
select * from sysobjects where xtype= ‘U’ ;
– 顯示錶結構
sp_help/sp_columns 表名;

2.查詢前10條數據

mysql:
select * from student limit 10;

sqlserver:
select top 10 * from student ;

3.獲取當前時間函數

mysql:
now();

sqlserver:
getdate();

3.從數據庫定位到某張表

mysql:
select password from Info.users;

sqlserver:
select password from Info.dbo.users;
或者
select password from Info…users;

3.判斷是否爲空設置默認值函數

mysql:
isnull(expr1, expr2);

sqlserver:
ifnull(expr1, expr2);

3.分頁查詢

mysql:

SELECT
     *
FROM
    student
LIMIT (PageNo - 1) * PageSize,PageSize;

sqlserver:

SELECT
    TOP PageSize *
FROM
    (
        SELECT
            ROW_NUMBER () OVER (ORDER BY id ASC) RowNumber ,*
        FROM
            student
    ) A
WHERE
    A.RowNumber > (PageNo - 1) * PageSize；

參考：
https://blog.csdn.net/weixin_37610397/article/details/80273070