Compare two tables in SQL Server with exceptions -


i have 2 tables this

tableyesterday:

column1 column2  column3     column4  ------------------------------------------------------ john     5584    samsung     2017-08-31 23:43:06.867 bob      4512    apple       2017-08-31 23:43:06.867 hana     1881    nokia       2017-08-31 23:43:06.867 hanz     4866    alcatel     2017-08-31 23:43:06.867 nicol    48633   android     2017-08-31 23:43:06.867  ---gone

tabletoday

column1 column2     column3     column4  ------------------------------------------------------ john     5584       samsung     2017-09-01 23:43:06.867 ---same entry bob      4542446    apple       2017-09-01 23:43:06.867 ---change in column2 hana     1881       halophone   2017-09-01 23:43:06.867 ---change in column3  hanz     4866       alcatel     2017-09-01 23:43:06.867 ---same entry mark     486654     alcatel     2017-09-01 23:43:06.867 ---new entry

i need select today's changes , insert tableofchanges. these 2 rows have selected:

tableofchanges

bob      4542446    apple       2017-09-01 23:43:06.867 hana     1881       halophone   2017-09-01 23:43:06.867

i created queries, cannot include column4 in final select. however, if select/insert without column4, not see column4 in result:

insert tableofchanges     select          column1, column2, column3               [dbo].[tabletoday]     except     select          column1, column2, column3               [dbo].[tableyesterday]               tabletoday.column4 = tableyesterday.column4

or

insert [dbo].[tableofchanges] (column1, column2, column3, column4)     select               column1, column2, column3, column4                         [dbo].[tableyesterday]                     (not exists (select column1, column2, column3, column4                      [dbo].[tabletoday]                      ([dbo].[tableyesterday].column1 = column1)                         , ([dbo].[tabletoday].column1 = column1)                          , ([dbo].[tableyesterday].column2 = column2)                         , ([dbo].[tabletoday].column2 = column2)                         , ([dbo].[tableyesterday].column3 = column3)                         , ([dbo].[tabletoday].column3 = column3)))

thank fix queries

you want records of today record same key different attributes exists in yesterday's data. supposing key column1, insert statement be:

insert tableofchanges   select column1, column2,column3    dbo.tabletoday t   exists   (     select *     tableyesterday y     y.column1 = t.column1     , (y.column2 <> t.column2 or y.column3 <> t.column3   );

if column2 or column3 can null, you'll have adjust where clause this, because <> doesn't detect changes or null.


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