Merge 2 MySQL tables - php

Question

I have 2 tables with the following structure:
Custom Pricing List
+------------+--------------+------------ +
| stock_code | stored_price | pricing_ref |
+------------+--------------+------------ +
Generic Pricing List
+------------+---------------------+--------------+-------------+--------------+
| stock_code | last_purchase_price | sales_price | description | qty_in_stock |
+------------+---------------------+--------------+-------------+--------------+
What I would like to return is the following:
+------------+---------------------+--------------+--------------+-------------+
| stock_code | last_purchase_price | sales_price | description | qty_in_stock |
+------------+---------------------+--------------+--------------+-------------+
Currently I am only querying the last table, using the following MySQL statement:
SELECT * FROM $table WHERE $column LIKE '%$term%' $or LIMIT 0,10
However I'd like to merge the 2 and still have the ability to do a wildcard search on the stock_code column.
All results MUST return the description and qty_in_stock. The sales_price in the result will be either stored_price from the Custom Pricing Table or sales_price from the Generic Pricing Table however stored_price takes precedence over sales_price from the Generic Pricing Table.
I understand I need to do a UNION query, however I am unsure how I could write it.
EDIT
Using the statement:
SELECT stock.*, price.*
FROM stock
LEFT INNER JOIN price
ON stock.stock_code = price.stock_code
WHERE stock.stock_code LIKE '%123%'
LIMIT 0,10
I now receive the following error:
#1064 - 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 'INNER JOIN price
ON stock.stock_code = price.stock_code
WHERE stock.stoc' at line 3

Answer 1

I think you can join both the tables. Try this:
SELECT
generic.stock_code,
generic.last_purchase_price,
IFNULL(custom.stored_price, generic.sales_price) AS actual_price,
generic.description,
generic.qty_in_stock
FROM
Generic_Pricing_List generic
JOIN Custom_Pricing_List custom
on custom.stock_code = generic.stock_code
WHERE $column LIKE '%$term%' $or LIMIT 0,10;
If stored_price is not null and is defined, it will be picked up. Otherwise, sales_price will be picked up.

Answer 2

SELECT g.*
FROM Generic_Pricing_List g
LEFT JOIN Custom_Pricing_List c
ON g.stock_code = c.stock_code
WHERE g.Search_Column LIKE '%Term%'
LIMIT 0,10

Answer 3

Left Inner Join will get you all rows from Generic_Pricing_List and matching rows from Custom_Pricing_List.
SELECT Generic_Pricing_List.*, Custom_Pricing_List.stored_price, Custom_Pricing_List.pricing_ref
FROM Generic_Pricing_List
LEFT INNER JOIN Custom_Pricing_List
ON Generic_Pricing_List.stock_code = Custom_Pricing_List.stock_code
WHERE Generic_Pricing_List.Search_Column LIKE '%Term%'
LIMIT 0,10

Answer 4

SELECT t1.*, t2.field1, t2.field2
FROM $table1 AS t1
LEFT JOIN $table2 AS t2 ON (t1.stock_code = t2.stock_code)
WHERE t1.$column LIKE '%$term%' $or
LIMIT 0,10
simply use JOIN

Answer 5

You could use a union, but it's not required. The union, however, might be more efficient with larger data sets because "if"s can be expensive. Quick and dirty:
SELECT gpl.stock_code, last_purchase_price, if(stored_price is null, sales_price, stored_price) as sales_price, description, qty_in_stock
FROM Generic_Pricing_List gpl
LEFT JOIN Custom_Pricing_List cpl
ON gpl.stock_code = cpl.stock_code
AND cpl.stored_price != ''
AND cpl.stored_price IS NOT NULL
WHERE $column LIKE '%$term%' $or
LIMIT 0,10
Using a union:
SELECT * FROM
(SELECT gpl.stock_code, last_purchase_price, stored_price as sales_price, description, qty_in_stock
FROM Generic_Pricing_List gpl
JOIN Custom_Pricing_List cpl
ON gpl.stock_code = cpl.stock_code
AND cpl.stored_price != ''
AND cpl.stored_price IS NOT NULL
WHERE $column LIKE '%$term%' $or
UNION
SELECT gpl.stock_code, last_purchase_price, sales_price, description, qty_in_stock
FROM Generic_Pricing_List gpl
WHERE $column LIKE '%$term%' $or) foo
GROUP BY foo.stock_code
LIMIT 0,10
Be careful of the "or" statement being injected, as it might cause problems with the results.