![]() ![]() Select * from employees where country = 'France' Find the employees who are from France and their salary is less than 80000.The below query will help you rename the address column to country.Īlter table employees rename column address to country You can use the alter command to change a table.Select * from employees where email is null You can find the missing values in a column using the IS NULL operator.Display unique address from the employees’ table:.Now, you have the employees’ table ready, let’s explore a few queries in this PostgreSQL tutorial. Select Header as yes, delimiter as comma, and click on ok.Right-click on the employees table > Select Import/Export > Choose Import.Now, create another table called Employees using PostgreSQL pgAdmin. Select all the movies whose rating is either 8.7 or 9.0:.SQL query to display the movies whose genre is Action:.SQL query to select all the movies between 8.5 and 9.0:.SQL query to learn the movie details with imdb_ratings greater than 8.7:.Now, you will learn how to filter data using the Where clause in this PostgreSQL tutorial. Now, you will understand the update and delete commands in this PostgreSQL tutorial. Click on save, and it will create your table. ![]() Assign the column names - Student_rollno (integer), Student_name (character varying), Student_gender (character).Right-click on the Tables > select Create Table.Now, create a Students table on the pgAdmin. You will see all the columns present in the movies database. Got to test > Refresh schemas > Tables > movies > Columns Under Databases, there is the test database. In the browsers window, click on the databases dropdown. Go to PgAdmin and explore the table and the columns The movies table will have four columns - movie id, movie name, movie genre, IMDB ratings. Now, create a table called “movies” in this PostgreSQL tutorial. The alias name becomes the new column name. In the above three examples, you saw the “as” keyword for giving an alias name to any operation. You will perform some simple operations in this PostgreSQL tutorial. The query editor opens, type - select version() Right-click on the test database, choose the Query Tool. Next, you will look at how to write queries using pgAdmin in this PostgreSQL tutorial. Open the SQL Shell (psql) and key in the username and password. Once you install PostgreSQL on your system, you will access the SQL Shell and pgAdmin. Connect to PostgreSQL Using SQL Shell (psql). It’s now time to get started with the hands-on demo part in this PostgreSQL tutorial. Postgresql supports Multiversion Concurrency Control (MVCC).It can also work with documents like JSON and XML. It also supports structured data types such as date/time, array, range. PostgreSQL supports various data types such as integer, string, and boolean. ![]() PostgreSQL supports multiple programming interfaces such as Java, C, C++, and Python.
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