Beginner question: adding restrictions to JOIN command?

So I'm trying to figure out how to add restrictions to JOIN commands. I've got these two tables AGENTS(aid, aname, city) and ORDERS(ordnum, cid, aid, qty, dollars). I'm trying to display all the agent names (aname) that are associated with the particular cid values 'c003' and 'c006' (the cid column contains values c001 through c006). Here is what I tried:
SQL> SELECT aname FROM agents JOIN orders ON agents.aid = orders.aid WHERE cid='003' OR cid='006';
Now I'm totally new to SQL so this may contain an obvious error, but I thought it made sense to simply put a WHERE clause at the end to place a restriction on the selection. Help would really be appreciated because I have been trying to figure out how to do this for hours.

Welcome to the forum!
user11920272 wrote:
So I'm trying to figure out how to add restrictions to JOIN commands. I've got these two tables AGENTS(aid, aname, city) and ORDERS(ordnum, cid, aid, qty, dollars). I'm trying to display all the agent names (aname) that are associated with the particular cid values 'c003' and 'c006' (the cid column contains values c001 through c006). Here is what I tried:Are the values of cid 4 characters, as above ('c003' and 'c006') or 3 characters, as below ('003' and '006').
SQL> SELECT aname FROM agents JOIN orders ON agents.aid = orders.aid WHERE cid='003' OR cid='006';You should always format your code. Use new lines and tabs to make the different clauses and the items in each clause stand out.
For example, the query below is exactly what you posted, with a little white space added:
SELECT aname
FROM    agents
JOIN      orders          ON     agents.aid      = orders.aid
WHERE     cid = '003'
OR     cid = '006'
;When posting code, or any formatted text, on this site, type these 6 characters:
(small letters only, inside curly brackets) before and after sections of formatted text, to preserve spacing.
Now I'm totally new to SQL so this may contain an obvious error, but I thought it made sense to simply put a WHERE clause at the end to place a restriction on the selection. Help would really be appreciated because I have been trying to figure out how to do this for hours.I don't see any obvious errors. You should get all the agents who have at least one order with either cid '003' or '006'.
If there can be many orders for the same agent, then you'll get the agent's name repeated as many times as they have orders with the given cids. If that's so, but you want each aname to appear only once, then change "SELECT" at the very beginning to "SELECT DISTINCT".
Aside from the possible duplicates, the query above looks like a reasonable way to get from point A to point B. Of course, if you're starting from point X and not A, and/or you want to go to point Y rather than point B, then it's not the route you want.
So where are you, and where do you want to go?
Please post a little sample data (maybe 2 to 5 rows from each table) and the results you want to get from that data.

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