what does the @> operator in postgres do? - Stack Overflow
May 2, 2016 · The at sign (@) is optional noise. The amounts of the different units are implicitly added with appropriate sign accounting. ago negates all the fields. This syntax is also used for …
syntax - What does :: do in PostgreSQL? - Stack Overflow
Mar 21, 2013 · A type cast specifies a conversion from one data type to another. PostgreSQL accepts two equivalent syntaxes for type casts, the PostgreSQL-specific value::type and the …
What is the difference between `->>` and `->` in Postgres SQL?
Postgres offers 2 operators to get a JSON member: the arrow operator: -> returns type JSON or JSONB; the double arrow operator: ->> returns type text; We must also understand that we …
Meaning of different command line prompts in PostgreSQL?
Oct 29, 2013 · psql (9.1.10) Type "help" for help. postgres=# CREATE DATABASE exampledb postgres-# After I entered the CREATE DB command the prompt changed from ending with …
sql - PostgreSQL IF statement - Stack Overflow
Mar 4, 2014 · How can I do such query in Postgres? IF (select count(*) from orders) > 0 THEN DELETE from orders ELSE INSERT INTO orders values (1,2,3);
How to detect query which holds the lock in Postgres?
Postgres has a very rich system catalog exposed via SQL tables. PG's statistics collector is a subsystem that supports collection and reporting of information about server activity. Now to …
Postgresql SELECT if string contains - Stack Overflow
One thing non-intuitive thing is that for postgres, position is 1 based, not 0 based. For example select position('a' in 'abc') returns 1. And if there is no match it returns 0.
database - PostgreSQL "DESCRIBE TABLE" - Stack Overflow
Sep 20, 2008 · In postgres \d is used to describe the table structure. e.g. \d schema_name.table_name. this command will provide you the basic info of table such as, …
How to set auto increment primary key in PostgreSQL?
I have a table in PostgreSQL with many columns, and I want to add an auto increment primary key. I tried to create a column called id of type BIGSERIAL but pgadmin responded with an …
Using psql how do I list extensions installed in a database?
May 4, 2018 · psql -h localhost -d postgres -U username -E. with an -E switch which gives you the details of the hidden commands that any alias is using. Once you are IN you can simply do a …