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

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!