How to query 2 SQL tables & change data with 1 query - mysql

Question

i'm having difficulties on query 2 tables & change the data on those 2 tables.
Here's what i wanted to do.
Get Table B "Max Qty" - Table A ("Actual Qty" - "WIP Qty") = Table B "Topup Qty"
Then change "Signal" value into NULL or 1-4 legend base on (("Actual Qty" - "WIP Qty") / "Max Qty") x 100%
Legend
NULL = More than or equal to 60%
1 = Less than or equal to 60%
2 = Less than or equal to 50%
3 = Less than or equal to 30%
4 = Less than or equal to 0%
From this:
TABLE A
- Products Actual Qty WIP QTY
- Product A 5 0
- Product B 5 0
- Product C 733 72
- Product D 532 90
- Product E 510 360
TABLE B
- MIN QTY MAX QTY TOPUP QTY SIGNAL
- 100 1000 NULL NULL
- 329 857 NULL NULL
- 393 1025 NULL NULL
- 262 683 NULL NULL
- 319 832 NULL NULL
To become like this:
TABLE A
- Products Actual Qty WIP QTY
- Product A 5 0
- Product B 5 0
- Product C 733 72
- Product D 532 90
- Product E 510 360
TABLE B
- MIN QTY MAX QTY TOPUP QTY SIGNAL
- 100 1000 995 4
- 329 857 852 4
- 393 1025 220 NULL
- 262 683 61 NULL
- 319 832 680 4

Answer 1

I am assuming that TableB has some relation to TableA
This will not be possible if there is no way to relate between them.
DECLARE #tableA TABLE(Products VARCHAR(50), Actual_Qty INT, WIP_Qty INT)
DECLARE #tableB TABLE(Products VARCHAR(50), Min_Qty INT, Max_Qty INT, Topup_Qty INT, Signal INT)
INSERT INTO #tableA VALUES
('Product A',5, 0),
('Product B', 5, 0),
('Product C', 733 , 72),
('Product D', 532 , 90),
('Product E', 510 , 360)
INSERT INTO #tableB VALUES
('Product A',100, 1000,995, 4),
('Product B',329, 857 ,852, 4),
('Product C',393, 1025,220, NULL),
('Product D',262, 683 ,61 , NULL),
('Product E',319, 832 ,680, 4)
SELECT A.Products,A.Actual_Qty,A.WIP_Qty,A.Actual_Qty-A.WIP_Qty Topup,'>' [ ],B.Products,B.Min_Qty,B.Max_Qty,B.Topup_Qty,B.Signal, 'now calculate > ' [ ]
, CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty SignalTest
, CASE
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty >= 60 THEN 1
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty BETWEEN 50 AND 60 THEN 2
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty BETWEEN 30 AND 50 THEN 3
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty < 30 THEN 4
END Signal
FROM #tableA A
INNER JOIN #tableB B ON B.Products = A.Products
/*Here is the update but, you can switch the tables for your tables*/
UPDATE B
SET B.Signal = (SELECT CASE
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty >= 60 THEN 1
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty BETWEEN 50 AND 60 THEN 2
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty BETWEEN 30 AND 50 THEN 3
WHEN CONVERT(MONEY,(A.Actual_Qty-A.WIP_Qty )*100)/B.Max_Qty < 30 THEN 4
END Signal)
FROM #tableA A
INNER JOIN #tableB B ON B.Products = A.Products
SELECT
*
FROM #tableB