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How to using IF Statement in WHERE clause

原文 2016-01-19 04:06:24 5 1 mysql/ sql

How to using IF statement in WHERE? Below code doesn't works

SELECT item.item_id, 
       item.item_name, 
       item.item_qty 
IF(sell.product_qty IS NULL, item.item_qty, item.item_qty - SUM(sell.product_qty)),
       sell.date_order, 
       sell.date_shipping
FROM item
     OUTER JOIN sell
                ON item.item_id = sell.product_item_id
WHERE NOW() BETWEEN sell.date_order AND sell.date_shipping

1 answers

You should use CASE statement.

CASE WHEN sell.product_qty IS NULL THEN item.item_qty 
ELSE item.item_qty - SUM(sell.product_qty) END

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