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A schema in database management systems represents a set of rules that regulate/handle a database. It is a logical structure that holds various database objects like views, tables, indexes, sequences, etc. In Postgres, “public” is a Default schema. So, by default, Postgres users can access the "public" schema and create objects in it, such as views, tables, etc.
The SET SEARCH_PATH command, however, allows a user to set any other …
In PostgreSQL, use the CREATE DATABASE command along with the “WITH TEMPLATE” parameter to copy or clone a database.
In PostgreSQL, conditional expressions are used to select one of the multiple values based on the Boolean condition.
Postgres supports a couple of native JSON operators to query the data from a JSON column. These operators include a short arrow “->” and a long arrow “->>”.
In PostgreSQL, the TO_TIMESTAMP() function is used to convert a Unix or Posix Timestamp to a date or time value.
The CASE statement is one of the conditional expressions that is used to create conditional queries. Postgres supports two forms of the CASE statement: A Searched CASE and a simple CASE.
The NOT EQUAL operator is one of the comparison operators that check if the input values are equal or not. It is symbolized as “!=” or “<>”.
Postgres offers various ways to convert a TIMESTAMP to a DATE, such as TO_CHAR() function, CAST operator, EXTRACT function, etc.
To get the Unix Timestamp in PostgreSQL, the EXTRACT() and DATE_PART() functions are used with the EPOCH argument.
To query the ARRAY data in Postgres, the SELECT statement is used. Postgres allows us to query the data of an entire array or a specific array index.
