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  • 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:
  • Meaning of different command line prompts in PostgreSQL?
    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 "=#" to "-#" I would like to know what this change means and what the implications are for receiving and processing commands
  • 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
  • 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:
  • database - PostgreSQL DESCRIBE TABLE - Stack Overflow
    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, columns, type and modifiers If you want more info about table use \d+ schema_name table_name this will give you extra info such as, storage, stats target and description
  • 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:
  • sql - Not equal and null in Postgres - Stack Overflow
    In PostgreSQL: <> or != means Not equal, but cannot treat NULL as a comparable value IS DISTINCT FROM means Not equal, and can treat NULL as a comparable value





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