[英]SQL Table data compare
我需要比較兩個表行,並且還僅顯示具有不同數據的庫倫,即來自兩個表的數據都不匹配。假設Table1和Table2具有50列,並且只有錯覺記錄為5,那么該庫倫需要進入Select語句。
比較部分已通過聯合查詢完成,我的障礙是如何提出錯誤的行列名稱。
一種方法是將所有此類列名的列表串聯在一個字符串中,如下所示:
select
T1.id, case when t1.col1<> t2.col1 then 'Col1;' else '' end +
case when t1.col2<> t2.col2 then 'Col2;' else '' end
-- similar case statementes for all th columns you want to be included
-- in the list
as Mismatchedcolumns
from Table1 T1
Join Table2 T2 on T1.id = T2.id
如果您正在查看所有不匹配列的列表,請參見以下示例
CREATE TABLE TableA
([Product] varchar(1), [Qty] int, [Price] int, [Comments] varchar(3))
;
INSERT INTO TableA
([Product], [Qty], [Price], [Comments])
VALUES
('A', 20, 500, 'xyz'),
('B', 50, 200, 'xyz'),
('C', 90, 100, 'abc'),
('D', 50, 500, 'xyz')
;
CREATE TABLE TableB
([Product] varchar(1), [Qty] int, [Price] int, [Comments] varchar(3))
;
INSERT INTO TableB
([Product], [Qty], [Price], [Comments])
VALUES
('B', 70, 200, 'cv'),
('C', 90, 200, 'wsd'),
('D', 40, 400, 'xyz'),
('E', 50, 500, 'xyz')
;
SELECT b.Product,
b.Qty,
b.Price,
Result = CASE WHEN a.product IS NULL THEN 'New'
ELSE 'Updated: ' +
STUFF( CASE WHEN a.Qty != b.Qty THEN ',Qty' ELSE '' END +
CASE WHEN a.Price != b.Price THEN ',Price' ELSE '' END,
1, 1, '')
END
FROM TableB b
LEFT JOIN TableA a
ON a.Product = b.Product
WHERE a.Product IS NULL
OR a.Qty != b.Qty
OR a.Price != b.Price
union
SELECT
a.Product,a.Qty,a.Price, 'NewA' as Result
FROM
TABLEA a left join
TABLEB b on a.Product = b.Product
WHERE b.Product is null
SQL Server 2008中解決方案的修改版比較同一數據庫中的兩個表,並更改get列
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