Pick records since last particular day of week

I want to pick and SUM values since last wednesday until NOW() in mysql. How can I do that?

Sorry for incomplete questi开发者_StackOverflow社区on, by the last Wednesday I did not mean to hard-code the date, rather I want my program to run that query, so it cannot hard-code--- Needs a flexible solution. Please help...

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select date_sub(now(), interval dayofweek(date_sub(now(), interval 4 day)) day);

This works on any day of the week and always returns the Wednesday which has most recently passed. On a Wednesday itself, it returns the previous Wednesday. The next day, it returns yesterday

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Genesis is right (He's very right, use his suggestion), but as an intellectual exercise: This is the best pure MySQL I could think of:

SELECT * FROM TABLE 
   WHERE 
     DATE_COLUMN > DATE_SUB( NOW(), INTERVAL DAYOFWEEK(NOW()) + 3 DAY);

NOW - DAYOFWEEK => this past Saturday. Weds. is three days before that.

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SELECT SUM(value) FROM table WHERE date > '2011-07-20'

You should calculate your date from your programming language (fastest solution)