Question

So I have two tables. Table1 have two columns, col1 and col2, where col1 is already filled. The other table, Table2, has many columns but there is 1 column, sub, that I need and I need it to fill the 2nd column in Table1.

The problem when I use

INSERT INTO Table1 (col2) SELECT Table2.sub FROM Table2

is that, yes, it copies the content of the required column to Table1 but it creates a new row for each.

Table1 looks like:

+-----+------+
|col1 | col2 |
+-----+------+
|data | NULL | 
+-----+------+
|data2| Null |
+-----+------+

After doing the INSERT query above, I get:

+-----+------+
|col1 | col2 |
+-----+------+
|data | NULL | 
+-----+------+
|data2| Null |
+-----+------+
|Null | data4|
+-----+------+
|Null | data5|
+-----+------+

What I need to look like is:

+-----+-------+
|col1 | col2  |
+-----+-------+
|data | data4 | 
+-----+-------+
|data2| data5 |
+-----+-------+

Any ideas?

Answer 1

try below query

UPDATE Table1 set col2= SELECT Table2.sub FROM Table2 where Table1.col1=Table2.col1

OR

UPDATE Table1 set col2= (SELECT Table2.sub FROM Table2 where Table1.col1=Table2.col1)

I believe you have col1 in Table2 too as without that you can’t compare two tables…

Let me know if it works….