#Sqlight insert if doesnt already exist update#

#Sqlight insert if doesnt already exist update#

If, instead, we want to update rows when they already exist in the table. Seems to me that there is no need to EVER deal with the pseudokeys. ON CONFLICT construct lets you define what PostgreSQL should do if a row you. (select house_id from houses where address = new.address) With that statement, it will insert the new record if it doesn't already exists on your table. Select (select name_id from names where name = new.name), Insert or ignore into houses (address) select new.address where new.address is not null If the table already exists, no action will be taken. Insert or ignore into names (name) values (new.name) The IF NOT EXISTS syntax will only proceed with the creation of the table if it does not already exist. Select raise(ABORT, 'Name cannot be NULL') where new.name is null Where (peasants.name_id is null or peasants.name_id = names.name_id)Īnd (peasants.house_id is null or peasants.house_id = houses.house_id) Ĭreate trigger ins_person instead of insert into persons

create table namesĪddress text not null collate nocase unique It is actually not needed for anything at all. It also does not really matter what some excrement-head thinks 'after the fact' - they can either accept the answer 'I don't know' (which by the way is an incorrect answer - the correct answer would be 'that information was not recorded').Īnd going back to the post to which you replied, it only appears to the uneducated that there is a need to know the pseudokey for the row. Playing with pseudokeys will not be helpful in this regard. Unless the inserted record contains a timestamp of when it was inserted, there is no way to tell when the record was inserted.

If you do not, a query for a non-existent tag will do a full table scan. Well, that is a design flaw (failure to store needed information) and has nothing whatsoever to do with the question asked. SELECT EXISTS (SELECT 1 FROM myTbl WHERE utag'tag' LIMIT 1) Selecting 1 is the accepted practice if you don't need something from the record, though what you select shouldn't really matter either way.