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In this section, we are going to understand the working of PostgreSQL Subquery, which allows us to create a difficult query. And we also see examples of subqueries with different clauses such as SELECT, FROM, and WHERE, different Conditions such as IN, EXISTS, and different Queries such as SELECT, INSERT, UPDATE, and DELETE. Introduction of PostgreSQL Subquery A subquery is a command used within another query. In contrast, the INNER…

In this section, we are going to understand the working of PostgreSQL upsert attribute, which is used to insert or modify the data if the row that is being inserted already and be present in the table with the help of insert on Conflict command. In RDBMS (relational database management system), the term upsert is known as merge. When we are inserting…

In this section, we are going to understand the working of the PostgreSQL IDENTITY and GENERATED constraint, which is used to generate the PostgreSQL Identity column for a particular column, examples of altering an Identity column and understand the working of Sequence options with example. We will also see the example of adding an identity column to the current…

In this section, we are going to understand the working of the PostgreSQL Sequence, examples of PostgreSQL Sequence, and understand how the sequence object is used to create a sequence of numbers, and see the example nextval() function. And we also see the example of creating an ascending and descending sequence using the CREATE SEQUENCE command and remove the Sequence with the…

In this section, we are going to understand the working of PostgreSQL Column Aliasing, which is used to give a temporary name to the column in the particular command. What is PostgreSQL Column Alias? In PostgreSQL, a Column alias is used to give a short name to the column in the select list of a SELECT command in a…

In this section, we are going to understand the working of PostgreSQL temporary table and how to create and remove it. How to Create a PostgreSQL temporary table A temporary table is a brief table; its name means; it presents at the time of a database session. The PostgreSQL automatically drops the temporary tables at the end…

In this section, we are going to understand the working of the PostgreSQL TRUNCATE TABLE command to delete all records from huge tables quickly. To delete all data from a table, we use the DELETE command. When a table contains a lot of records and is also not useful, in that case, we will use the TRUNCATE TABLE command to…

In this section, we are going to understand how the PostgreSQL Rename column condition works in the Alter table command for renaming one and various columns of a table. PostgreSQL Rename COLUMN command We use the ALTER TABLE command with the Rename Column condition to rename a column of a table. Syntax The syntax of the Alter table rename column command is given below: In the…

In this section, we are going to discuss how we can change the columns data type with the help of the ALTER TABLE command. Command of changing the column data type We will use the ALTER TABLE command to modify the column’s data type. The basic syntax of changing the column datatype is as follows: In the above syntax, we will…