Postgresql if exists

See how DigitalOcean Compares. Integration or Development issues? Scalable Hosting Servers. Built For Developers. Simple drag-and-drop UI. How do you delete a table in SQL? The EXISTS accepts an argument which is a subquery.

The result of EXISTS depends on whether any row returned by the subquery, and not on the content of. EXISTS is often used with the correlated subquery. I want to avoid this exception by checking if this table exists or not. There are no provisions for indexes in the SQL standard. The Exists operator is said to have been met when at least one row is found in the subquery.

For which I am trying the following query. PostgreSQL create table if not exists. It needs to check if the table already exists and create only if not found? I know about the exists feature, but that does not help me with the given situation.

When any SQL query is used inside another SQL query then it is called a subquery. The complicated query can be written easily by dividing a large query into multiple subqueries. I am trying to get a psql function that would truncate a given table name if it exists. Here is the code : CREATE OR REPLACE FU. I am working on a function that allows me to add an index if it does not exist.

Check if postgresql database exists (case insensitive way). I am running into the problem that I cannot get a list of indexes to compare to. That is why we call the action is upsert (update or insert). This is a similar iss.

Stack Exchange Network. What I need to find is syntax which looks for table name SR_JW_temp_Test, and if it exists , drop the table, then create one with the same name. There is no effective difference between dropping databases via this utility and via other methods for accessing the server. Checking to see if a constraint already exists should be easy. Hand many other database have syntax for it.

But I want it to rename a table with the same name if it finds an existing one. Example - Using EXISTS Condition. You may wish to delete records in one table based on values in another table.

You can also perform more complicated deletes.