Question

I have two tables, one is called video_2, one is called vlan.

Table vlan has two columns, one is vlan_id, one is area, it’s like an index.

video_2 contains several columns, vlan_id and area are two of them, the vlan_id value in this table is captured in other way

Now I want to insert a column of data into “area” column in table video_2 if the vlan_id is listed in vlan table

Here’s my command, but it has syntax error, can anyone help?

"INSERT INTO video_2 (area), SELECT vlan.area FROM vlan WHERE vlan.vlan_id = video_2.vlan_id"

Answer 1

Try this:

INSERT INTO video_2 (area) 
select area
from vlan
where vlan.vlan_id = (select vlan_id from video_2)

Try this:

INSERT INTO video_2 (area) 
select area
from vlan
INNER JOIN video_2 ON vlan.vlan_id video_2.vlan_id;

Or: This:

INSERT INTO video_2 (area) 
select area
from vlan
WHERE vlan.vlan_id IN (SELECT vlan_id FROM video_2);