Postgresql insert if not exists return id

If the row was already in the table, it just returns blank ( not the ID as intended). INSERT if not exists, else return id. Insert if not exists, else return id in postgresql. Ask Question Asked years, months ago. Active years, months ago.

This question needs details or clarity. It is not currently accepting. Do I need to perform another SELECT? Viewed 265k times 301. The CTE will return the from the first half of the union if an existing record exists (so will show old id ), and the second.

This option basically helps to perform DML actions like, Insert IF not Exists , Update IF Exists. Previously, we have to use upsert or merge statement to do this kind of operation. CREATE TABLE mytable ( id SERIAL, name VARCHAR(10) PRIMARY KEY) Now I want to add names to this table, but only if they not exist in the table already, and in both cases return the id.

I have also published an article on it. Postgres before trying to insert it. I cannot rule out concurrent inserts. Inserting into table only if the row does not already exist. Also, the case in which a column name list is omitte but not all the columns are filled from the VALUES clause or query , is disallowed by the standard.

I wrote a trigger function to convert inserts into updates if the record exists already. I am not using rules because the table is populated via COPY. EXISTS clause is used with a subquery in a SQL statement. The output of EXISTS depends on the numbers of records returned by the subquery but does not depends on the values of the records.

The result of EXISTS will be true if the associated subquery returns at least one row. I am trying to add a not exists into the Insert Statement, so when the record already exists in the table it does not insert a duplciate, but I keep. How to Access Generated ID in Application.

That is why we call the action is upsert (update or insert ). When you create a new table, it does not have any data. Alban Hertroys Your trigger is the wrong way around. UPSERT( insert on conflict do)，当插入遇到约束错误时. Returning empty on insert.

Si la pratique habituelle est de toujours soit insérer ou mise à jour si elle existe , pourquoi est-ce? You can always check the return value of your SQL query to see whether the table existed or not when you executed the create statement. , it unlocks many cool features!