我从SSRS报告中获得以下TSQL查询，该报告查询我们当前正在运行的仓库管理系统。有没有更好的方法来编写此查询？必须有更好的方法来编写这种类型的查询，但目前我还是看不到它。
查询将未结发票金额放入每周列。
SELECT ContCode, TradingName, DaysFromInvoice, CreditLimit,
CASE WHEN [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+] < 0 THEN [0-7] + [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+]
WHEN [8-14] + [15-21] + [22-28] + [29-35] + [36-42] < 0 THEN [0-7] + [8-14] + [15-21] + [22-28] + [29-35] + [36-42]
WHEN [8-14] + [15-21] + [22-28] + [29-35] < 0 THEN [0-7] + [8-14] + [15-21] + [22-28] + [29-35]
WHEN [8-14] + [15-21] + [22-28] < 0 THEN [0-7] + [8-14] + [15-21] + [22-28]
WHEN [8-14] + [15-21] < 0 THEN [0-7] + [8-14] + [15-21]
WHEN [8-14] < 0 THEN [0-7] + [8-14]
WHEN [0-7] = 0 AND [0-7] + [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+] = 0 AND Total <> 0 THEN Total
ELSE [0-7] END [0-7],
CASE WHEN [15-21] + [22-28] + [29-35] + [36-42] + [43+] < 0 AND [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+] < 0 THEN 0
WHEN [15-21] + [22-28] + [29-35] + [36-42] + [43+] < 0 AND [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+] >= 0 THEN [8-14] + [15-21] + [22-28] + [29-35] + [36-42] + [43+]
WHEN [15-21] + [22-28] + [29-35] + [36-42] < 0 AND [8-14] + [15-21] + [22-28] + [29-35] + [36-42] >= 0 THEN [8-14] + [15-21] + [22-28] + [29-35] + [36-42]
WHEN [15-21] + [22-28] + [29-35] < 0 AND [8-14] + [15-21] + [22-28] + [29-35] >= 0 THEN [8-14] + [15-21] + [22-28] + [29-35]
WHEN [15-21] + [22-28] < 0 AND [8-14] + [15-21] + [22-28] >= 0 THEN [8-14] + [15-21] + [22-28]
WHEN [15-21] < 0 AND [8-14] + [15-21] >= 0 THEN [8-14] + [15-21]
WHEN [8-14] < 0 THEN 0
ELSE [8-14] END [8-14],
CASE WHEN [22-28] + [29-35] + [36-42] + [43+] < 0 AND [15-21] + [22-28] + [29-35] + [36-42] + [43+] < 0 THEN 0
WHEN [22-28] + [29-35] + [36-42] + [43+] < 0 AND [15-21] + [22-28] + [29-35] + [36-42] + [43+] >= 0 THEN [15-21] + [22-28] + [29-35] + [36-42] + [43+]
WHEN [22-28] + [29-35] + [36-42] < 0 AND [15-21] + [22-28] + [29-35] + [36-42] >= 0 THEN [15-21] + [22-28] + [29-35] + [36-42]
WHEN [22-28] + [29-35] < 0 AND [15-21] + [22-28] + [29-35] >= 0 THEN [15-21] + [22-28] + [29-35]
WHEN [22-28] < 0 AND [15-21] + [22-28] >= 0 THEN [15-21] + [22-28]
WHEN [15-21] < 0 THEN 0
ELSE [15-21] END [15-21],
CASE WHEN [29-35] + [36-42] + [43+] < 0 AND [22-28] + [29-35] + [36-42] + [43+] < 0 THEN 0
WHEN [29-35] + [36-42] + [43+] < 0 AND [22-28] + [29-35] + [36-42] + [43+] >= 0 THEN [22-28] + [29-35] + [36-42] + [43+]
WHEN [29-35] + [36-42] < 0 AND [22-28] + [29-35] + [36-42] >= 0 THEN [22-28] + [29-35] + [36-42]
WHEN [29-35] < 0 AND [22-28] + [29-35] >= 0 THEN [22-28] + [29-35]
WHEN [22-28] < 0 THEN 0
ELSE [22-28] END [22-28],
CASE WHEN [36-42] + [43+] < 0 AND [29-35] + [36-42] + [43+] < 0 THEN 0
WHEN [36-42] + [43+] < 0 AND [29-35] + [36-42] + [43+] >= 0 THEN [29-35] + [36-42] + [43+]
WHEN [36-42] < 0 AND [29-35] + [36-42] >= 0 THEN [29-35] + [36-42]
WHEN [29-35] < 0 THEN 0
ELSE [29-35] END [29-35],
CASE WHEN [36-42] + [43+] < 0 AND [36-42] + [43+] < 0 THEN 0
WHEN [36-42] + [43+] < 0 THEN 0
WHEN [43+] < 0 THEN [36-42] + [43+]
ELSE [36-42] END [36-42],
CASE WHEN [43+] < 0 THEN 0 ELSE [43+] END [43+],
Total
FROM
(
SELECT ContGnrl.ContCode,ContGnrl.TradingName,ContBals.DaysFromInvoice, ContAcct.CreditLimit,
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) < 8 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [0-7],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) BETWEEN 8 AND 14 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [8-14],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) BETWEEN 15 AND 21 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [15-21],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) BETWEEN 22 AND 28 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [22-28],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) BETWEEN 29 AND 35 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [29-35],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) BETWEEN 36 AND 42 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0) [36-42],
COALESCE(SUM(CASE WHEN DATEDIFF(day, ContTran.TranDate, cast(convert(varchar(10), getdate(), 102) as datetime)) >= 43 AND ContTran.TranType <> 'P' THEN ContTran.Outstanding END), 0)
+ COALESCE(SUM(CASE WHEN ContTran.TranType = 'P' THEN ContTran.Outstanding END), 0) [43+],
COALESCE(SUM(ContTran.Outstanding), 0) Total
FROM ContGnrl
JOIN ContBals
ON ContGnrl.ContCode = ContBals.ContCode
JOIN ContAcct
ON ContBals.ContCode = ContAcct.ContCode
LEFT JOIN ContTran
ON ContGnrl.ContCode = ContTran.ContCode
AND (ContTran.Finalised = 0)
AND (ContTran.TranType IN ('I','C','J','P','D'))
GROUP BY ContGnrl.ContCode,ContGnrl.TradingName,ContBals.DaysFromInvoice, ContAcct.CreditLimit
HAVING COALESCE(SUM(ContTran.Outstanding), 0) <> 0
) t
ORDER BY TradingName