MYSQL SELECT rows where sum is over 200 [duplicate] - mysql

Question

This question already has answers here:
SQL - HAVING vs. WHERE
(9 answers)
Closed 4 years ago.
How to select rows where sum of a row is over 200?
I tried all kinds of combinations with grouping, setting AS something and using WHERE clause
Current attempt as follow
SELECT something.CustomerName, something.CustomerAge, cars.Prices,
SUM(cars.Price) AS Amount
FROM cars
INNER JOIN something ON something.CustomerNo=Cars.CustomerNo
GROUP BY AMOUNT
WHERE AMOUNT > '200'
I could not find a tutorial on how to do this

Answer 1

According to your current attempt where clause should go before group by clause
SELECT something.CustomerName, something.CustomerAge,
SUM(cars.Price) AS Amount
FROM cars
INNER JOIN something ON something.CustomerNo=Cars.CustomerNo
GROUP BY something.CustomerName, something.CustomerAge
HAVING SUM(cars.Price) > 200;
However, you actually need to apply your filter on Amount but, you can't do that via where clause for that you would need to apply having clause filter rather than where clause
My today advice is to use table alise that could be more readable and easy to use/implement
SELECT s.CustomerName, s.CustomerAge,
SUM(c.Price) AS Amount
FROM cars as c -- use of alise to make it more effective or readable
INNER JOIN something as s ON s.CustomerNo = c.CustomerNo -- and use that alise everywhere entire the query
GROUP BY s.CustomerName, s.CustomerAge
HAVING SUM(c.Price) > 200;

Answer 2

You could use a subquery to do your maths, then select the values you want
SELECT * FROM
(
SELECT (col1 + col2) AS SumOfCols, table.* FROM table
)
WHERE SumOfCols > 200
Or another similar approach is to join an ad-hoc table
SELECT table.* FROM table
INNER JOIN
(
SELECT ID, (col1 + col2) AS SumOfCols FROM table
) AS TableSums ON TableSums.ID = table. ID
WHERE TableSums.SumOfCols > 200