MySQL 联合查询：在一个联合查询中向 TEMP1 表 ClaimID 传递 TEMP ClaimID 字段值

Question

CREATE DEFINER=`root`@`localhost` PROCEDURE `SP_DupAuditCriteria_1`()
BEGIN
    set @RowNbr=concat(date_format(curdate(),'%Y%m%d'),'0000000');

select temp.* from
(SELECT c.*, concat(c.VendorID,a.VendorID) as MergeH200A, concat(a.VendorID,c.VendorID) as MergeH200B, 'New' as Record_Type, @RowNbr:= @RowNbr + 1 AS ClaimID
FROM tbldupaudit_currentitems AS c
    inner join tbldupaudit_archiveitems a 
        on c.InvoiceID = a.InvoiceID
        and c.GrossAmount = a.GrossAmount) as temp
    inner join tbldupaudit_archiveitems b
        on temp.InvoiceID = b.InvoiceID
        and temp.GrossAmount = b.GrossAmount
        and temp.VendorID = b.VendorID
        and temp.VoucherID <> b.VoucherID
Union all
select temp1.* from
(SELECT f.*, concat(f.VendorID,d.VendorID) as MergeH200A, concat(d.VendorID,f.VendorID) as MergeH200B, 'ARCHIVE' as Record_Type, 1 AS ClaimID
FROM tbldupaudit_archiveitems AS f
    inner join tbldupaudit_currentitems d 
        on f.InvoiceID = d.InvoiceID
        and f.GrossAmount = d.GrossAmount) as temp1
    inner join tbldupaudit_currentitems e
        on temp1.InvoiceID = e.InvoiceID
        and temp1.GrossAmount = e.GrossAmount
        and temp1.VendorID = e.VendorID
        and temp1.VoucherID <> e.VoucherID
order by InvoiceID, Record_Type DESC;

END 

尝试为每对创建唯一的 ClaimID。 我能够为前半联合所有生成序列号，但相同的 ClaimID 不能在另一半联合全部生成。 请帮助我了解如何为匹配的项目创建/生成一个唯一 ID。

谢谢！ ] 1

Answer 1

在第二个 select （在 UNION ALL 之后）中，您没有递增 var，因此如果您希望两个值都递增，请尝试在第二个中使用 var

select temp.* 
from (
    SELECT c.*, concat(c.VendorID,a.VendorID) as MergeH200A, concat(a.VendorID,c.VendorID) as MergeH200B, 'New' as Record_Type
        , @RowNbr:= @RowNbr + 1 AS ClaimID
    FROM tbldupaudit_currentitems AS c
    inner join tbldupaudit_archiveitems a on c.InvoiceID = a.InvoiceID
        and c.GrossAmount = a.GrossAmount
    ) as temp
inner join tbldupaudit_archiveitems b on temp.InvoiceID = b.InvoiceID
    and temp.GrossAmount = b.GrossAmount
        and temp.VendorID = b.VendorID
            and temp.VoucherID <> b.VoucherID
Union all
select temp1.* 
from ( 
    SELECT f.*, concat(f.VendorID,d.VendorID) as MergeH200A, concat(d.VendorID,f.VendorID) as MergeH200B, 'ARCHIVE' as Record_Type
        , @RowNbr:= @RowNbr + 1 AS ClaimID
    FROM tbldupaudit_archiveitems AS f
    inner join tbldupaudit_currentitems d on f.InvoiceID = d.InvoiceID
        and f.GrossAmount = d.GrossAmount
) as temp1
inner join tbldupaudit_currentitems e on temp1.InvoiceID = e.InvoiceID
      and temp1.GrossAmount = e.GrossAmount
        and temp1.VendorID = e.VendorID
            and temp1.VoucherID <> e.VoucherID
order by InvoiceID, Record_Type DESC;

Answer 2

建模示例 - 见小提琴：

SELECT CONCAT( 'prefix', LPAD( CASE @prev 
                               WHEN @prev := InvoiceID 
                               THEN @num
                               ELSE @num := @num + 1
                               END, 8, '0' ) ) ClaimID, InvoiceID, Amount, FromTable
FROM ( SELECT InvoiceID, Amount, 'CurrentItems' FromTable
       FROM CurrentItems
       UNION ALL
       SELECT InvoiceID, Amount, 'ArchivedItems'
       FROM ArchivedItems
       WHERE EXISTS ( SELECT NULL 
                      FROM CurrentItems
                      WHERE CurrentItems.InvoiceID = ArchivedItems.InvoiceID) ) unioned,
     ( SELECT @prev := 0, @num := 1000 ) variables
ORDER BY InvoiceID, FromTable DESC;