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
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:
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)
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);
java - Is it possible to specify the schema when connecting to postgres . . . If you leave the schema unspecified, Postgres defaults to a schema named public within the database See the manual, section 5 9 2 The Public Schema To quote hat manual: In the previous sections we created tables without specifying any schema names
How to get the next sequence value in PostgreSQL? Current I have a problem in finding the next sequence value of the column The my_list table is created by CREATE SEQUENCE my_list_id_seq; CREATE TABLE IF NOT EXISTS my_list (id int PRIMARY KEY UNI