How to use case statements in mysql using joins?
0
I am working on product and category and product discount thing. I have done for a product discount. But the problem in while calculating category_discount. Here is my code :
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount = 0 THEN products.product_price
WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
END) AS amount
FROM products
join
categories
on products.category_id = categories.id
See my result below it's not calculating category_discount for the first row:-
mysql sql
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
add a comment |
0
I am working on product and category and product discount thing. I have done for a product discount. But the problem in while calculating category_discount. Here is my code :
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount = 0 THEN products.product_price
WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
END) AS amount
FROM products
join
categories
on products.category_id = categories.id
See my result below it's not calculating category_discount for the first row:-
mysql sql
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
1
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22
add a comment |
0
0
0
I am working on product and category and product discount thing. I have done for a product discount. But the problem in while calculating category_discount. Here is my code :
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount = 0 THEN products.product_price
WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
END) AS amount
FROM products
join
categories
on products.category_id = categories.id
See my result below it's not calculating category_discount for the first row:-
mysql sql
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
I am working on product and category and product discount thing. I have done for a product discount. But the problem in while calculating category_discount. Here is my code :
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount = 0 THEN products.product_price
WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
END) AS amount
FROM products
join
categories
on products.category_id = categories.id
See my result below it's not calculating category_discount for the first row:-
mysql sql
mysql sql
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
edited Nov 21 '18 at 7:47
Eren ÇELİK
10617
10617
asked Nov 21 '18 at 7:41
kunalkunal
12010
asked Nov 21 '18 at 7:41
kunalkunal
12010
asked Nov 21 '18 at 7:41
kunalkunal
12010
12010
1
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22
add a comment |
1
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22
1
1
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22
add a comment |
1 Answer
1
active
oldest
votes
1
Then When-statements are evaluated in order, until one is fulfilled.
In first row, the first When-clause is fulfilled, so there is no discount. Try below instead:
WHEN products.product_discount = 0 AND categories.category_discount = 0 THEN products.product_price
Or even reorder like this:
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
ELSE products.product_price
END) AS amount
...
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
add a comment |
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1 Answer
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1
Then When-statements are evaluated in order, until one is fulfilled.
In first row, the first When-clause is fulfilled, so there is no discount. Try below instead:
WHEN products.product_discount = 0 AND categories.category_discount = 0 THEN products.product_price
Or even reorder like this:
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
ELSE products.product_price
END) AS amount
...
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
add a comment |
1
Then When-statements are evaluated in order, until one is fulfilled.
In first row, the first When-clause is fulfilled, so there is no discount. Try below instead:
WHEN products.product_discount = 0 AND categories.category_discount = 0 THEN products.product_price
Or even reorder like this:
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
ELSE products.product_price
END) AS amount
...
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
add a comment |
1
1
1
Then When-statements are evaluated in order, until one is fulfilled.
In first row, the first When-clause is fulfilled, so there is no discount. Try below instead:
WHEN products.product_discount = 0 AND categories.category_discount = 0 THEN products.product_price
Or even reorder like this:
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
ELSE products.product_price
END) AS amount
...
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
Then When-statements are evaluated in order, until one is fulfilled.
In first row, the first When-clause is fulfilled, so there is no discount. Try below instead:
WHEN products.product_discount = 0 AND categories.category_discount = 0 THEN products.product_price
Or even reorder like this:
SELECT products.id, products.product_name, products.product_price, products.product_discount, categories.category_discount,
(CASE WHEN products.product_discount != 0 THEN products.product_price - ( products.product_price * products.product_discount)/100
WHEN categories.category_discount !=0 THEN products.product_price - ( products.product_price * categories.category_discount)/100
ELSE products.product_price
END) AS amount
...
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
answered Nov 21 '18 at 7:52
SASSAS
2,5241637
2,5241637
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
add a comment |
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
Nice! Please mark as accepted if it answered your question fully.
– SAS
Nov 21 '18 at 7:58
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
yeah sure its shwoing you can accept answer in 10 min
– kunal
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
Oh, sorry, thanks! Happy to help.
– SAS
Nov 21 '18 at 7:59
add a comment |
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1
No images please. Please provide a relevant and minimal sample data showcasing your requirements, and expected output. Please go through this link once: Why should I provide an MCVE for what seems to me to be a very simple SQL query?
– Madhur Bhaiya
Nov 21 '18 at 7:42
Case expression (since it returns a value.)
– jarlh
Nov 21 '18 at 8:22