如何将"get DATA for DATE + 1" 翻译成sql 查询（可选的oracle 过程解决方案）

Question

你好，我好像找不到解决这个问题的方法

我有这个问题

（注意：日期和所有列的数据类型都使用VARCHAR）

SELECT tableA.CODE,tableA.CREDIT, Q1, Q2, Q3, CountedStock, SystemStock
FROM
    (
    select table1.CODE as CODE, table1.credit as CREDIT, Q1, Q2, Q3, Q1 + Q2 - Q3 CountedStock
    from
       (select stockurp.code as CODE, stockurp.credit, stockurp.quantity as Q1, reportenableurp.qty as Q2
       from stockurp join reportenableurp 
       on stockurp.code = reportenableurp.code and stockurp.credit = reportenableurp.credit 
   //  where stockurp.date = '20151001' and reportenableurp.date = '2015-10-01')   
       table1
       join
       (select accountid, credit, count (recharge.credit) as Q3
       from recharge
       group by accountid, credit) table2
       ON table1.CODE=table2.accountid
       AND table1.credit=table2.credit
    )tableA
JOIN
    (
    select stockurp.code as KODE, stockurp.credit as KREDIT, stockurp.quantity as SystemStock
    from stockurp
 // where stockurp.date = '20151002' )  
    tableB
on CODE=KODE and CREDIT=KREDIT
where CountedStock <> SystemStock

主要关注这些行

where stockurp.date = '20151001' and reportenableurp.date = '2015-10-01')

和

where stockurp.date = '20151002'

整个查询的重点是比较CountedStock和SystemStock的数量。要获得 CountedStock，我必须使用查询来计算 N 日期的股票。得到CountedStock后，我想将它与SystemStock进行比较，后者是N+1日期的股票。

如果CountedStock和SystemStock不匹配，那就是问题，这就是我想找的，但这与这里的问题无关。

问题是，我想获取每个日期的结果。当前查询只给出 1 个日期的结果，我必须自己指定它 (20151001)。

让我卡住的是 SystemStock 日期，因为如果我想获得每个日期的结果，那么我必须写类似

的东西

where stockurp.date = stockurp.date+1

这在 sql 中显然没有意义，我似乎无法将该算法转换为 sql 查询。

甚至可以在 sql 查询中这样做吗？我将非常感谢你的帮助。哦，有人建议我应该使用程序（我正在使用 Toad for Oracle），但我不知道如何使用。

所以如果你有想法为此做一个oracle程序，请告诉。提前谢谢大家。

Answer 1

因为您将日期存储为字符串（您永远不应该这样做；this is about storing as numbers，但同样适用），您需要将字符串从一种格式转换为另一种格式以进行比较，在第二种情况下还要加一天。这意味着将字符串弹跳到实际日期并返回到字符串；在第一个嵌套连接中，它看起来像：

reportenableurp.date = to_char(to_date(stockurp.date, 'YYYYMMDD'), 'YYYY-MM-DD')

'date' 当然不是有效的列名，但我将比较的左侧保留为字符串，并将右侧转换两次以防 'date' 列是索引（如果将其存储为实际日期也会更好）。您也可以将双方都转换为日期进行比较。

从每个内部视图中提取日期可以让您将它们作为连接条件进行比较；最小的变化：

SELECT CountedDate, SystemDate, CODE, CREDIT, Q1, Q2, Q3, CountedStock, SystemStock
FROM
    (
    select table1.dat as CountedDate, table1.CODE as CODE, table1.credit as CREDIT, Q1, Q2, Q3, Q1 + Q2 - Q3 CountedStock
    from
       (select stockurp.dat, stockurp.code as CODE, stockurp.credit, stockurp.quantity as Q1, reportenableurp.qty as Q2
       from stockurp join reportenableurp 
       on stockurp.code = reportenableurp.code and stockurp.credit = reportenableurp.credit 
       and reportenableurp.dat = to_char(to_date(stockurp.dat, 'YYYYMMDD'), 'YYYY-MM-DD')
       )   
       table1
       join
       (select accountid, credit, count (recharge.credit) as Q3
       from recharge
       group by accountid, credit) table2
       ON table1.CODE=table2.accountid
       AND table1.credit=table2.credit
    ) tableA
JOIN
    (
    select stockurp.dat as SystemDate, stockurp.code as KODE, stockurp.credit as KREDIT, stockurp.quantity as SystemStock
    from stockurp ) tableB
on CODE=KODE and CREDIT=KREDIT
and SystemDate = to_char(to_date(CountedDate, 'YYYYMMDD') + 1, 'YYYYMMDD')
where CountedStock <> SystemStock;

除非我遗漏了什么，否则我可能会用更简单的连接替换内联视图：

SELECT stock_1.dat as CountedDate, stock_2.dat as SystemDate, stock_1.code,
  stock_1.credit, stock_1.quantity as Q1, report.qty as Q2, count(recharge.credit) as Q3,
  stock_1.quantity + report.qty - count(recharge.credit) as CountedStock,
  stock_2.quantity as SystemStock
FROM stockurp stock_1
JOIN reportenableurp report
ON report.code = stock_1.code
AND report.credit = stock_1.credit
AND report.dat = to_char(to_date(stock_1.dat, 'YYYYMMDD'), 'YYYY-MM-DD')
JOIN recharge
ON recharge.accountid = stock_1.code
AND recharge.credit = stock_1.credit
JOIN stockurp stock_2
ON stock_2.code = stock_1.code
AND stock_2.credit = stock_1.credit
AND stock_2.dat = to_char(to_date(stock_1.dat, 'YYYYMMDD') + 1, 'YYYYMMDD')
GROUP BY stock_1.dat, stock_2.dat, stock_1.code, stock_1.credit, stock_1.quantity,
  report.qty, stock_2.quantity
HAVING stock_1.quantity + report.qty - count(recharge.credit) <> stock_2.quantity;

Quick SQL Fiddle demo.

当然，这是假设您的所有 'date' 字符串实际上都可以成功转换为实际日期，并且您没有任何损坏的数据。

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