[英]SQL Table data compare
我需要比较两个表行,并且还仅显示具有不同数据的库伦,即来自两个表的数据都不匹配。假设Table1和Table2具有50列,并且只有错觉记录为5,那么该库伦需要进入Select语句。
比较部分已通过联合查询完成,我的障碍是如何提出错误的行列名称。
一种方法是将所有此类列名的列表串联在一个字符串中,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,请参见以下示例
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中解决方案的修改版比较同一数据库中的两个表,并更改get列
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