"Common MySQL Queries. Extending Chapter 9 of Get it Done with MySQL 5&Up

Here's an example: Compute date from year, week number and weekday:

SET @yr=2012, @wk=26, @day=0;
SELECT Str_To_Date( Concat(@yr,'-',@wk,'-',If(@day=7,0,@day) ), '%Y-%U-%w' ) AS Date;

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