功能强大的SQL语句

1. 复制表结构

Sql代码

   1. select * into B from A where 1=0;   

select * into B from A where 1=0;

 2.复制表记录 复制某些字段

Sql代码

   1. insert into B(a, b, c) select d, e, f from A;   

insert into B(a, b, c) select d, e, f from A;

  复制整个表记录

Sql代码

   1. insert into B select * from A;   

insert into B select * from A;

3.外连接查询

Sql代码

   1. select A.a, A.b, A.c, B.c, B.d, B.f from A LEFT OUT JOIN B ON A.a = B.c; 　  

select A.a, A.b, A.c, B.c, B.d, B.f from A LEFT OUT JOIN B ON A.a = B.c; 　

4.取特定时间内的数据

Sql代码

   1. select * from A where datediff("minute", 开始时间字段, getdate())>时间差 　  

select * from A where datediff("minute", 开始时间字段, getdate())>时间差 　

5.两张关联表，删除主表中已经在副表中没有的信息

Sql代码

   1. delete from A where not exists(select ID from B where A.infid=B.infid );  

delete from A where not exists(select ID from B where A.infid=B.infid );

6. 复杂的多级条件查询

Sql代码

   1. SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE   

   2.      FROM TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE   

   3.                   FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND   

   4.                         FROM TABLE2   

   5.                         WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) =   

   6.                               TO_CHAR(SYSDATE, ’’YYYY/MM’’)) X,   

   7.                        (SELECT NUM, UPD_DATE, STOCK_ONHAND   

   8.                         FROM TABLE2   

   9.                         WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) =   

  10.                               TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, ’’YYYY/MM’’)   

  11.                               || ’’/01’’,’’YYYY/MM/DD’’) - 1, ’’YYYY/MM’’) ) Y,   

  12.                    WHERE X.NUM = Y.NUM （+）AND X.INBOUND_QTY   

  13.                                  + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B   

  14.                    WHERE A.NUM = B.NUM;　  

  15.    

SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE

     FROM TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE

                  FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND

                        FROM TABLE2

                        WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) =

                              TO_CHAR(SYSDATE, ’’YYYY/MM’’)) X,

                       (SELECT NUM, UPD_DATE, STOCK_ONHAND

                        FROM TABLE2

                        WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) =

                              TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, ’’YYYY/MM’’)

                              || ’’/01’’,’’YYYY/MM/DD’’) - 1, ’’YYYY/MM’’) ) Y,

                   WHERE X.NUM = Y.NUM （+）AND X.INBOUND_QTY

                                 + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B

                   WHERE A.NUM = B.NUM;　

 

 　　 7.两个表之间的关联数据筛选

 

Sql代码

   1. select * from A   

   2.      where not exists(select id from B where A.id=B.id)   

   3.            and A.a="*"  

   4.            and A.b="*"  

   5.      order by A.c,A.d,A.e;  

select * from A

     where not exists(select id from B where A.id=B.id)

           and A.a="*"

           and A.b="*"

     order by A.c,A.d,A.e;

Sql代码

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