Update values from one column in same table to another in SQL Server

Question

I m trying to overwrite values that are found in TYPE1 with values that are found in TYPE2   I wrote this SQL to try it out  but for some reason it isn t updating   select   from stuff  update stuff set TYPE1   TYPE2 where TYPE1 is null   update stuff set TYPE1   TYPE2 where TYPE1   Blank     http   www sqlfiddle com   3 a4733 17  Any reason why my values in TYPE1 are not updating

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UPDATE  tbl user  SET  name  concat  tbl user first name   tbl user last name   WHERE student roll gt 965

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This answer about updating column from a part of another column in the same table   update T1 set domainname    New value  --Example   SELECT LEFT TableName col  CHARINDEX     TableName col -1  STRIPPED STRING FROM TableName where TableName col   T2 Emp ID  from TableName T1 INNER JOIN     TableName T2 ON      T1 ID  T2 ID

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UPDATE TABLE NAME SET COLUMN A   COLUMN B    Much easier  At least on Oracle SQL  i don t know if this works on other dialects as well

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UPDATE a SET a column1   b column2 FROM myTable a  INNER JOIN myTable b on a myID   b myID   in order for both  a  and  b  to work  both aliases must be defined

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You put select query before update queries  so you just see initial data  Put select   from stuff  to the end of list

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update TABLE 1 a set COLUMN 1    select COLUMN 2 from TABLE 1 b where a ID   b ID

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This works for me  select   from stuff  update stuff set TYPE1   TYPE2 where TYPE1 is null   update stuff set TYPE1   TYPE2 where TYPE1   Blank    select   from stuff

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Your select statement was before the update statement  see Updated fiddle

[sql] Update values from one column in same table to another in SQL Server

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