Alien

you can try this SELECT SUM(budget_tot) AS budget_total, SUM(extrac_tot) AS extracost_total FROM PROJECT, SBUDGETS, EXTRA_COSTS WHERE extrac_proj_id = proj_id AND budget_proj_id = proj_id AND proj_id = 143

I am not sure why you have parentheses. try this $sql_command = \"SELECT * FROM \" . $tbl . \" WHERE id = \'$id\'\";

create one more table that contains a mapping of client_ID to group_ID

briefly scheme through it... looks like a cool lib...will try out soon thanks =)

I think that u mis-understand my question.... I only have one query, which is a select statment. But the select statement is too long, it contains about 6000 characters, so it can\'t pass through...

yea...indexing will help...but for each insert/delete, I have to pay for it since the index tree changes everytime I insert/delete. I am not sure whether it is worth...I will check with my database schema. Thanks.

hmm...it is the same as what I post \"source filename\". what can I do if I want to use a php script?

I\'m curious how people optimize their select statements if they are complex. MySQL 4.0 doesn\'t support nested queries(4.1 supports, but it is an alpha version), so many complex queries have to be broken down with some iterations in php scripts. At the beginning I wrote a nested query and thought that it worked, after I ran it...I remembered that it was not a PostgreSQL DB....so I broke down the query into 3 queries with 2 loops. However, the tables are too big(one has 200,000 rows, another has 20,000 rows, the last one has 6,000 rows), so the process takes about 2 hrs to complete on a LAN. I just want to know, in general, how can I optimize select statements?

I have a 5000-character-long query. I saved it in a textfile and sent it successfully in this way: mysql> source myquery.txt However, when I passed the query to the server in a php script, not the whole query was sent; only part of it was sent. How can I fix it?