How to UPDATE multiple rows in T1 with unique value from T2

Hi,
having on mind update query with where clause:
WHERE (SELECT LEFT(ColumnName,7) FROM tblName) = emp2.ColumnName
error:
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.
What am I suppose to change in WHERE clause....
Note: there is always unique value in T2 while, in T1, there could be both, only one value to be updated or number of them that all need to be updated with that unique value from T2 (alias emp2)
T1
T2
colimn1          column2               column3        column4
001A001A       string1                001A001       string10
001A001B        string2                001A005      string20
001B005A        string3
001B005B        string4
001B005C    string5
should become:
T1
colimn1          column2
001A001A       string10
001A001B        string10
001B005A        string20
001B005B        string20
001B005C    string20
UPDATET1
SET column2 = emp2.column4
FROM T2 as emp2
    WHERE (SELECT LEFT(column1,7) FROM T1 = emp2.column3

Hi daredevil3011,
Based on my test, the error is caused by where statement in the query. Just as the error message, in your where statement, there is a subquery “SELECT LEFT(ColumnName,7) FROM tblName” follows ”=”, this is not permitted in SQL Server.
To fix this issue, please modify your query to like below:
UPDATE T1
SET column2 = emp2.column4
FROM T2 as emp2
WHERE LEFT(column1,7) = emp2.column3
Reference:
WHERE (Transact-SQL)
If there are any other questions, please feel free to ask.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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