Custom report who lines is columns in SQL Server - sql

Question

I need make one custom report in SQL Server. I have one table called ProductsTable, in this table have the products tables of prices.
| id | description |
| 1 | TABLE A |
| 2 | TABLE B |
| 3 | TABLE C |
| 4 | TABLE D |
Now, i have the table ProductsTablePrices with all products prices and his tables.
| id | idproduct | idtable | price |
| 1 | 1 | 1 | 1.00 |
| 1 | 1 | 2 | 1.50 |
| 1 | 1 | 3 | 2.00 |
| 1 | 1 | 4 | 5.00 |
And finally, i have the Products table.
| id | name |
| 1 | Paper |
I need create one select to get one result like this...
| name | TABLE A | TABLE B | TABLE C | TABLE D |
| Paper | 1.00 | 1.50 | 2.00 | 5.00 |
Thanks!

Answer 1

Try this:
SELECT
P.name,
SUM(CASE WHEN PT.description = 'TABLE A' THEN PP.price END) [TABLE A],
SUM(CASE WHEN PT.description = 'TABLE B' THEN PP.price END) [TABLE B],
SUM(CASE WHEN PT.description = 'TABLE C' THEN PP.price END) [TABLE C],
SUM(CASE WHEN PT.description = 'TABLE D' THEN PP.price END) [TABLE D]
FROM Products P
JOIN ProductsTablePrices PP
ON P.id = PP.idproduct
JOIN ProductsTable PT
ON PP.idtable = PT.id
GROUP BY P.name

Answer 2

I Use that to resolve my problem.
DECLARE #NameColumnTable VARCHAR(100)
DECLARE #CountColumns INT
DECLARE #ColumnsPivot varchar(6000)
DECLARE #Flag INT
SELECT #CountColumns = count(*) FROM ProductsTable
SET #Flag = 0
WHILE (#Flag <= #CountColumns)
BEGIN
SELECT #NameColumnTable = Name FROM ProductsTable
WHERE id = #Flag
ORDER BY Name ASC
SET #ColumnsPivot = ISNULL(#ColumnsPivot,'') + 'SUM(CASE WHEN PT.description = ''' + #NameColumnTable + ''' THEN PP.price END) [' + #NameColumnTable + ']'
IF #Flag <> #CountColumns
BEGIN
SET #ColumnsPivot = #ColumnsPivot + ','
END
SET #ColumnsPivot = #ColumnsPivot + CHAR(13)
SET #Flag = #Flag + 1
END
DECLARE #SQLFINAL VARCHAR(5000)
SET #SQLFINAL = 'SELECT
P.name,
' + #ColumnsPivot + '
FROM Products P
JOIN ProductsTablePrices PP
ON P.id = PP.idproduct
JOIN ProductsTable PT
ON PP.idtable = PT.id
GROUP BY P.name
ORDER BY P.name'
EXEC(#SQLFINAL)
I don't know if is a good practice, but works great and performance as well.
Thanks!