Executing Different mysql selects based on a field - php

Question

i have a series of tables for an asset checkout system. there are 2 types of assets.. Stocks and Assets. they all have barcodess stored in a separate table. this is how my tables look
Checkouts table: (sipe_check_out)
+----+--------+----------+----------+-----+---------------------+----------+------+----------+
| id | job_id | stock_id | asset_id | qty | out_time | user_out | note | depot_id |
+----+--------+----------+----------+-----+---------------------+----------+------+----------+
| 1 | 1625 | 0 | 1026 | 1 | 0000-00-00 00:00:00 | 1288 | | 1 |
+----+--------+----------+----------+-----+---------------------+----------+------+----------+
| 2 | 1625 | 8 | 0 | 10 | 0000-00-00 00:00:00 | 1288 | | 0 |
+----+--------+----------+----------+-----+---------------------+----------+------+----------+
barcodes table: (sipe_barcodes)
+----+----------+----------+---------+
| id | stock_id | asset_id | barcode |
+----+----------+----------+---------+
| 1 | 0 | 1026 | AR2221 |
+----+----------+----------+---------+
| 2 | 8 | 0 | MAR0001 |
+----+----------+----------+---------+
Stock Table: (sipe_stock)
+-----+------------+-----------+--------+----------+---------------------+------+--------------+------+-------------+
| id | title | alt_title | status | category | last_updated | memo | replace_cost | flag | description |
+-----+------------+-----------+--------+----------+---------------------+------+--------------+------+-------------+
| 8 | Cable XLR | Cable XLR | 2 | 10 | 2019-01-03 20:45:40 | | 750 | 0 | |
+-----+------------+-----------+--------+----------+---------------------+------+--------------+------+-------------+
| 237 | Fresnel 1K | | 0 | 43 | 2019-01-02 19:08:45 | | 12000 | 0 | |
+-----+------------+-----------+--------+----------+---------------------+------+--------------+------+-------------+
Asset Table: (sipe_stock_asset)
+------+----------+-----+--------+--------+---------------------+------+---------------+-------------+-------+
| id | stock_id | qty | serial | status | status_change | memo | purchase_date | retire_date | depot |
+------+----------+-----+--------+--------+---------------------+------+---------------+-------------+-------+
| 1026 | 237 | 1 | | 0 | 2019-01-02 19:09:00 | NULL | NULL | NULL | 1 |
+------+----------+-----+--------+--------+---------------------+------+---------------+-------------+-------+
i need a list of all items checked out to a specific job_id. these items are sotred in the chekout table. but for display purpose i need to get the items barcode (stored in the barcodes table) , items title (stored in the stock table), and qty (stored in the checkout table)
this is my problem. the select query is different for a stock item and for an asset item.
if it is a stock item one needs to get the stock id from the checkout table then get the title from the stock table and the qty from the checkout table.
this is my working query to get stock items
SELECT
sipe_barcodes.barcode,
sipe_stock.title,
sipe_check_out.qty,
sipe_check_out.out_time
FROM
sipe_barcodes
INNER JOIN sipe_stock ON (sipe_barcodes.stock_id = sipe_stock.id)
INNER JOIN sipe_check_out ON (sipe_stock.id = sipe_check_out.stock_id)
WHERE
sipe_check_out.job_id = 1625
this returns the following
+---------+-----------+-----+---------------------+
| barcode | title | qty | out_time |
+---------+-----------+-----+---------------------+
| MAR0001 | Cable XLR | 10 | 0000-00-00 00:00:00 |
+---------+-----------+-----+---------------------+
If the item is a a stock. we get the asset_id from the checkout. but then we need to get the stock_id from the checkout table so we can get the stock title from the stock table. the qty from the checkout table and the barcode from the barcode table
this is my working query to get asset items
SELECT
sipe_barcodes.barcode,
sipe_stock.title,
sipe_check_out.qty,
sipe_check_out.out_time
FROM sipe_check_out
INNER JOIN sipe_stock_asset ON (sipe_check_out.asset_id = sipe_stock_asset.id)
INNER JOIN sipe_stock ON (sipe_stock_asset.stock_id = sipe_stock.id)
LEFT JOIN sipe_barcodes ON (sipe_check_out.asset_id = sipe_barcodes.asset_id)
WHERE sipe_check_out.job_id = 1625
this retuns this
+---------+------------+-----+---------------------+
| barcode | title | qty | out_time |
+---------+------------+-----+---------------------+
| AR2221 | Fresnel 1K | 1 | 0000-00-00 00:00:00 |
+---------+------------+-----+---------------------+
The Problem
how do i structure a single mysql query that can select all items checked out no matter if they are assets or stocks producing the following output
+---------+------------+-----+---------------------+
| barcode | title | qty | out_time |
+---------+------------+-----+---------------------+
| AR2221 | Fresnel 1K | 1 | 0000-00-00 00:00:00 |
+---------+------------+-----+---------------------+
| MAR0001 | Cable XLR | 10 | 0000-00-00 00:00:00 |
+---------+------------+-----+---------------------+
your help is much Appreciated
Thanks

Answer 1

You may use UNION with your provided select statements
SELECT
sipe_barcodes.barcode,
sipe_stock.title,
sipe_check_out.qty,
sipe_check_out.out_time
FROM
sipe_barcodes
INNER JOIN
sipe_stock ON (sipe_barcodes.stock_id = sipe_stock.id)
INNER JOIN
sipe_check_out ON (sipe_stock.id = sipe_check_out.stock_id)
WHERE
sipe_check_out.job_id = 1625
UNION ALL
SELECT
sipe_barcodes.barcode,
sipe_stock.title,
sipe_check_out.qty,
sipe_check_out.out_time
FROM
sipe_check_out
INNER JOIN
sipe_stock_asset ON (sipe_check_out.asset_id = sipe_stock_asset.id)
INNER JOIN
sipe_stock ON (sipe_stock_asset.stock_id = sipe_stock.id)
LEFT JOIN
sipe_barcodes ON (sipe_check_out.asset_id = sipe_barcodes.asset_id)
WHERE
sipe_check_out.job_id = 1625