I often use CASE WHEN ... to pivot tables. For example, splitting sales data by
year:
SELECT
s_product.name AS `Product`,
SUM(CASE WHEN YEAR(sales.Date)='2007' THEN sales.Total ELSE NULL END) AS
`2007`,
SUM(CASE WHEN YEAR(sales.Date)='2008' THEN sales.Total ELSE NULL END) AS
On 2014-10-08 1:38 PM, Jan Steinman wrote:
I often use CASE WHEN ... to pivot tables. For example, splitting sales data by
year:
SELECT
s_product.name AS `Product`,
SUM(CASE WHEN YEAR(sales.Date)='2007' THEN sales.Total ELSE NULL END) AS
`2007`,
SUM(CASE WHEN
2014/10/08 11:38 -0700, Jan Steinman
However, this pattern will often result in numerous empty columns -- empties
that would not be there had the table not been pivoted.
2014/10/08 16:42 -0500, Peter Brawley
MySQL stored procedures are less incomplete, and can do it, but they're
awkward.
