mysql 中 You can't specify target table for update in FROM clause错误mysql 中 You can't specify target t

mysql 中 You can't specify target table for update in FROM clause错误

mysql中You can't specify target table <tbl> for update in FROM clause错误的意思是说,不能先select出同一表中的某些值,再update这个表(在同一语句中)。

update issue i set i.group_date = (select t.groupDate from (SELECT @cdate := i.commit_date input_date, @last_sat := date_add(date_sub(date_sub(@cdate,interval day(@cdate)-1 day),interval 1 month), interval 6-date_format(date_sub(date_sub(@cdate,interval day(@cdate)-1 day),interval 1 month),'%w') day) last_sat, @this_sat := date_add(date_sub(@cdate,interval day(@cdate)-1 day), interval 6-date_format(date_sub(@cdate,interval day(@cdate)-1 day),'%w') day) this_sat, @next_sat := date_add(date_add(date_sub(@cdate,interval day(@cdate)-1 day),interval 1 month), interval 6-date_format(date_add(date_sub(@cdate,interval day(@cdate)-1 day),interval 1 month),'%w') day) next_sat, @last_point := if(day(@last_sat)-3>0,date_sub(@last_sat,interval 7 day),@last_sat) last_point, @this_point := if(day(@this_sat)-3>0,date_sub(@this_sat,interval 7 day),@this_sat) this_point, @next_point := if(day(@next_sat)-3>0,date_sub(@next_sat,interval 7 day),@next_sat) next_point , case when @cdate >= @last_point and @cdate < @this_point then concat( 'W', datediff(@cdate,@last_point) div 7 + 1, '/', year(@cdate),'-', if(month(@last_sat)>=10,month(@last_sat),concat('0',month(@last_sat))) ) when @cdate >=@this_point and @cdate < @next_point then concat( 'W', datediff(@cdate,@this_point) div 7 + 1,'/', year(@cdate),'-', if(month(@this_sat)>=10,month(@this_sat),concat('0',month(@this_sat)))) else concat( 'W', datediff(@cdate,@next_point) div 7 + 1,'/', year(@cdate),'-',if(month(@next_sat)>=10,month(@next_sat),concat('0',month(@next_sat)))) end as groupDate) t)

where i.id in ( select isus.id from (select isu.* from issue isu) isus );

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