Question

I have table that has two columns and I need to concatenate these two and update first column with result.
For example assume this is my table:

+----+-------+-------+
| id | col1  | col2  |
+----+-------+-------+
|  1 | text1 | text2 |
+----+-------+-------+
|  2 | text3 | text4 |
+----+-------+-------+

after concatenation my table should be:

+----+-------------+-------+
| id |    col1     | col2  |
+----+-------------+-------+
|  1 | text1.text2 | text2 |
+----+-------------+-------+
|  2 | text3.text4 | text4 |
+----+-------------+-------+

How can I do this using SQL?

Answer 1

Try this (for MySQL)

UPDATE your_table
SET col1 = CONCAT_WS('.', col1, col2)

and this for MS-SQL

UPDATE your_table
SET col1 =col1 || "." || col2