Combine multiple SQL queries into single query for speed - php

Question

I am working in PHP with Laravel and the page I have been given contains 3 SQL queries on separate tables but using the same criteria. I have tried combining them but the combined results are slower than the original. What can I do to increase rather than decrease the speed of these queries?
Here are my queries:
$searchFor = 'debtor_name';
$searchForBKR = 'estate_name';
$searchForHypotech = 'hypleg_lot_credit_debtor_name';
$arraySearch = explode(",", $request->input('name'));
$search = $searchFor . ' like "%';
$bkrSearch = $searchForBKR . ' like "%';
$hypotechSearch = $searchForHypotech . ' like "%';
$searchCompany = $searchCompanyFor . ' like "%';
$searchPlaintiff = $searchPlaintiffFor . ' like "%';
$searchDefendantName = $searchDefendantNameFor . ' like "%';
$search = $search . $arraySearch[0] . '%"';
$bkrSearch = $bkrSearch . $arraySearch[0] . '%"';
$hypotechSearch = $hypotechSearch . $arraySearch[0] . '%"';
$searchCompany = $searchCompany . $arraySearch[0] . '%"';
$searchPlaintiff = $searchPlaintiff . $arraySearch[0] . '%"';
$searchDefendantName = $searchDefendantName . $arraySearch[0] . '%"';
for ($i = 1; $i < count($arraySearch); $i++) {
$search = $search . " or " . $searchFor . ' like "%' . $arraySearch[$i] . '%"';
$bkrSearch = $bkrSearch . " or " . $searchForBKR . ' like "%' . $arraySearch[$i] . '%"';
$hypotechSearch = $hypotechSearch . " or " . $searchForHypotech . ' like "%' . $arraySearch[$i] . '%"';
$searchCompany = $searchCompany . " or " . $searchCompanyFor . ' like "%' . $arraySearch[$i] . '%"';
$searchPlaintiff = $searchPlaintiff . " or " . $searchPlaintiffFor . ' like "%' . $arraySearch[$i] . '%"';
$searchDefendantName = $searchDefendantName . " or " . $searchDefendantNameFor . ' like "%' . $arraySearch[$i] . '%"';
}
$sis = DB::select('select debtor_name, count(*) as sis_total from equifax_sis_regions' . $search . ')
group by debtor_name');
$bkr = DB::select('select estate_name as debtor_name, count(*) as bkr_total from equifax_bkr_regions' . $bkrSearch . ')
group by estate_name');
$hypotech = DB::select('select hypleg_lot_credit_debtor_name as debtor_name, count(*) as hypotech_total from equifax_hypotech_regions' . $hypotechSearch . ')
group by hypleg_lot_credit_debtor_name');
I have tried replacing the 3 queries by using outer joins like this:
$other = 'select debtor_name, count(debtor_name) as sis_total,
estate_name as debtor_name, count(estate_name) as bkr_total
hypleg_lot_credit_debtor_name as debtor_name, count(hypleg_lot_credit_debtor_name) as hypotech_total
from equifax_sis_regions outer join equifax_bkr_regions on (equifax_sis_regions.debtor_name=estate_name)
outer join equifax_hypotech_regions on (equifax_sis_regions.debtor_name=hypleg_lot_credit_debtor_name)
WHERE (' . $search . ') OR ' . $bkrSearch . ') OR (' . $hypotechSearch . ')
GROUP BY debtor_name, estate_name, hypleg_lot_credit_debtor_name';
but that is a much slower query to run. The database contains over 4 million rows and the difference in API calls to the 2 query versions is ~53 seconds for the original and ~78 seconds for the combined form. Is there any way I can modify this combined query to be faster rather than slower?
Thanks in advance

Answer 1

You can use the UNION ALL operator to combine multiple SELECT statements. You could combine them like this:
SELECT debtor_name, SUM(sis_total), SUM(bkr_total), SUM(hypotech_total)
FROM (
SELECT debtor_name, COUNT(*) AS sis_total, 0 AS bkr_total, 0 AS hypotech_total
FROM equifax_sis_regions
-- add where clause here
GROUP BY debtor_name
UNION ALL
SELECT estate_name AS debtor_name, 0 AS sis_total, COUNT(*) AS bkr_total, 0 AS hypotech_total
FROM equifax_bkr_regions
-- add where clause here
GROUP BY estate_name
UNION ALL
SELECT hypleg_lot_credit_debtor_name AS debtor_name, 0 AS sis_total, 0 AS bkr_total, COUNT(*) AS hypotech_total
FROM equifax_hypotech_regions
-- add where clause here
GROUP BY hypleg_lot_credit_debtor_name
) derived
GROUP BY debtor_name;