How to pass sql query with sql variables in php

Question

I want to pass following sql query in php

SET @rank=0; SELECT @rank:=@rank+1 AS rank, `percentage_obtained`  FROM `result`  ORDER BY percentage_obtained DESC

As here

mysql_query('SET @rank=0; SELECT @rank:=@rank+1 AS rank, `percentage_obtained`  FROM `result`  ORDER BY percentage_obtained DESC') or die(mysql_error());

But it throws following error

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT @rank:=@rank+1 AS rank, percentage_obtained FROM result ' at line 1

However it works when I run the query directly inside the database. Please assist.

I have an idea that this - @rank:=@rank is a problem, because it is a digit. It provides like this - SELECT 4 AS rank etc. — Alexey Shatrov
– Alexey Shatrov, Commented Mar 4, 2017 at 20:35
But this give right out put when I use it directly inside the MySQL db — Seeker
– Seeker, Commented Mar 4, 2017 at 20:38
Please do a print_r(your query); and post here. Also you set @rank=0, and then do an increment. Why don't do a SELECT 1 ? — Alexey Shatrov
– Alexey Shatrov, Commented Mar 4, 2017 at 20:40
Here it is: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT @rank:=@rank+1 AS rank, percentage_obtained FROM result ' at line 1 — Seeker
– Seeker, Commented Mar 4, 2017 at 20:44

Alexey Shatrov · Accepted Answer · 2017-03-04 20:47:40Z

1

mysql_query() doesn't support multiple queries, so you need to separate them. Also you can use mysqli_multi_query - but note, that you need mysqli instead of mysql

So

mysql_query('SET @rank=0') or die(mysql_error());
mysql_query('SELECT @rank:=@rank+1 AS rank, `percentage_obtained`  FROM `result`  ORDER BY percentage_obtained DESC') or die(mysql_error());

should handle this

edited Mar 4, 2017 at 20:47

answered Mar 4, 2017 at 20:43

Alexey Shatrov

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6 Comments

Seeker Over a year ago

Thank you, But how can I do it?

Alexey Shatrov Over a year ago

Just split into 2 queries

Seeker Over a year ago

Then it says: No database selected

Alexey Shatrov Over a year ago

Use mysql_select_db ('your database'); before queries.

Seeker Over a year ago

Database is already connected; it out put single queries without any errors.

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