Run a query consisting of subqueries only - sql

Question

I have a SQL query that only consists of sub queries, But I cannot run it I get an SQL error, What is the correct Syntax to run query consisting of sub queries only...?
Query:
SELECT COUNT(id) AS 'totalNumOfCustomers'
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime < '2012-01-01'
SELECT COUNT(id) AS 'totalNumOfCustomersPerMonth'
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime >='2012-01-01'
AND regTime < '2012-02-01'
SELECT COUNT(positions.id) AS 'totalPositions',
ROUND(SUM(amount),2) - ROUND(SUM(payout),2) AS 'grossIncome'
FROM positions
LEFT JOIN customers ON positions.customerId = customers.id
WHERE date >= '2012-01-01'
AND date < '2012-02-01'
AND customers.isDemo=0
AND customers.isLead=0
AND status != 'canceled'
I am running this in WorkBench, The error message is this:
Error Code: 1064. You Have an error in your SQL syntax

Answer 1

How about this
select
(SELECT COUNT(id)
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime < '2012-01-01') as totalNumOfCustomers,
(SELECT COUNT(id)
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime >='2012-01-01'
AND regTime < '2012-02-01') as totalNumOfCustomersPerMonth,
(SELECT COUNT(positions.id)
FROM positions
LEFT JOIN customers ON positions.customerId = customers.id
WHERE date >= '2012-01-01'
AND date < '2012-02-01'
AND customers.isDemo=0
AND customers.isLead=0
AND status != 'canceled') as totalPositions,
(SELECT ROUND(SUM(amount),2) - ROUND(SUM(payout),2)
FROM positions
LEFT JOIN customers ON positions.customerId = customers.id
WHERE date >= '2012-01-01'
AND date < '2012-02-01'
AND customers.isDemo=0
AND customers.isLead=0
AND status != 'canceled') as grossIncome;

Answer 2

I think you get error, because there is no ; ant the end of each query. No error message, so just guessing

Answer 3

The two first queries you can easily express as one query:
SELECT COUNT(case when regTime < '2012-01-01' end ) AS totalNumOfCustomers
, COUNT(case when >='2012-01-01' AND regTime < '2012-02-01' end ) AS totalNumOfCustomersPerMonth
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0 ;
As others have suggested you can then use a cross join to take the third query into play

Answer 4

You can run these queries by putting them in the from clause and combining them using CROSS JOIN:
SELECT *
FROM (SELECT COUNT(id) totalNumOfCustomers
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime < '2012-01-01'
) t1 CROSS JOIN
(SELECT COUNT(id) as totalNumOfCustomersPerMonth
FROM customers
WHERE customers.isDemo =0
AND customers.isLead=0
AND regTime >='2012-01-01'
AND regTime < '2012-02-01'
) t2 CROSS JOIN
(SELECT COUNT(positions.id) AS totalPositions,
ROUND(SUM(amount),2) - ROUND(SUM(payout),2) AS grossIncome
FROM positions LEFT JOIN
customers
ON positions.customerId = customers.id
WHERE date >= '2012-01-01'
AND date < '2012-02-01'
AND customers.isDemo=0
AND customers.isLead=0
AND status <> 'canceled'
) t3;
Note: don't use single quotes for column and table aliases. That will lead to confusion. Single quotes should only be used for string and date constants.