I created a table like this： CREATE TABLE record_trip (trip_id CHAR(1), gp_no CHAR(1), rec_date INTEGER, trun CHAR(1), ctrl_id CHAR(1), moment_value INTEGER, minutes_value INTEGER, set_value INTEGER ); CREATE UNIQUE INDEX i_record_trip ON record_trip (trip_id, gp_no, rec_date);
And the trigger like： CREATE TRIGGER trig1 before insert on record_trip when (select count(*) from record_trip where trip_id=new.trip_id AND gp_no=new.gp_no)>4 begin delete from record_trip where trip_id=new.trip_id AND gp_no=new.gp_no AND rec_date=(select rec_date from record_trip where trip_id=new.trip_id and gp_no = new.gp_no order by rec_date limit 1); end; I felt the when clause is wrong. It couldn't realize the intention of executing the trigger after the num of trip_id and gp_no is larger than 4. -- View this message in context: http://old.nabble.com/How-to-write-the-trigger--tp29331491p29331491.html Sent from the SQLite mailing list archive at Nabble.com. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
