what does the @ gt; operator in postgres do? - Stack Overflow 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 interval output, if IntervalStyle is set to postgres_verbose
syntax - What does :: do in PostgreSQL? - Stack Overflow 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 SQL-standard CAST(value AS type)
What is the difference between `- gt; gt;` and `- gt;` 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 now have 2 different kinds of null: (null) postgres null type; null json b null type; I created an example on jsfiddle Let's create a simple table with a JSONB field:
Postgres: INSERT if does not exist already - Stack Overflow In Postgres version 9 5 or higher you can use ON CONFLICT to avoid errors of contraints like @Arie mentioned above To know more options related to this INSERT query refer to Postgres Docs An alternative solution is by using try catch to handle runtime errors
sql - PostgreSQL IF statement - Stack Overflow How can I do such query in Postgres? IF (select count(*) from orders) gt; 0 THEN DELETE from orders ELSE INSERT INTO orders values (1,2,3);
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 error: ERROR:
Using psql how do I list extensions installed in a database? 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 \dx which gives you this:
Run PostgreSQL queries from the command line - Stack Overflow Open a command prompt and go to the directory where Postgres installed In my case my Postgres path is "D:\TOOLS\Postgresql-9 4 1-3" After that move to the bin directory of Postgres So command prompt shows as "D:\TOOLS\Postgresql-9 4 1-3\bin>"