如何使用插入和选择语句

Question

we are facing a big problem How can we insert value from 1 column to other column of same table

  SELECT *
From (
SELECT  answers.latitude as first_lat,answers.longitude as first_long ,answers.id as first_column  from answers  WHERE answers.question_id=142 and answers.survey_id=194
) as c1,
(
SELECT  answers.latitude as second_lat,answers.longitude as second_long ,answers.id   as second_column from answers  WHERE answers.question_id=146 and answers.survey_id=194
    ) as c2
    where first_column+1=second_column

My above query have following Result But now we are facing problem how can we insert Value from Second_lat to first lat ,long

May it helpfull Actual table structure These are two convective rows in database 146 & 142 Question_id 146 have lat ,long And we want to move lat ,long from 146 to 142

  id       question_id ,lat,long
   1     146 ,22.2222.11.1111
   2    142,0,0 
   3     146 ,22.2222.11.1111
   4    142,0,0 

Thanks in advance

Answer 1

UPDATE is the way to do it Something like as below. You might need to run two queries one for longitude and one for latitude. UPDATE answers t1 SET t1.longitude = (SELECT t2.longitude FROM answers t2 WHERE t1.rownum + 1 = t2.rownum)

Depending on the database you are using, that rownum might differ

Answer 2

Give this a try:

update answers as a1, answers as a2
  set a1.latitude=a2.latitude,
  a1.longitude=a2.longitude
where a1.id+1=a2.id
  and a1.question_id=142
  and a2.question_id=146
  and a1.survey_id=194
  and a2.survey_id=194