有个A表：
no pk balance
1 aaaa 10
2 aaaa 20
3 aaaa 50
4 aaaa 70
要求写个SQL渔具实现一下查询结果
no pk balance before_balance
1 aaaa 10
2 aaaa 20 10
3 aaaa 50 20
4 aaaa 70 50
速求啊 同志们 给力啊！！！！！！！！！！！
------解决方案--------------------
分析函数lag
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select PK,balance ,lag(balance )over(order by PKde) as before_balance
from A ;
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select no,pk,balance,lag(balance) over(order by balance)from A
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SELECT NO,PK,BALANCE,LAG(BALANCE)OVER(ORDER BY NO) BEFORE_BALANCE
FROM A_TABLE;
------解决方案--------------------
http://blog.csdn.net/pilearn/article/details/6841764
详细说明
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分析函数楼上的
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- SQL code
select pk balance lang(balance)over(order by pk) before_balance from A