PostgreSQL

PostgreSQL is a powerful, open-source object-relational database system that supports SQL and JSON querying. It's known for its robustness, scalability, and high performance. PostgreSQL features include full-text search, concurrency without read locks, and extensibility with custom functions. This makes it ideal for everything from small projects to large enterprise systems.

When an API response returns a list of objects, no matter the amount, pagination is supported. In paginated responses, objects are nested in a data attribute and have a has_more attribute that indicates whether you have reached the end of the last page. You can use the starting_after and endding_before query parameters to browse pages.

Create Table & Insert Values

When creating a table in postgresSQL it is important to use teh correct

creating a table in PostgreSQL, it is essential to use the correct syntax and configurations to ensure efficient data management and system performance.

  • Name
    CREATE_TABLE
    Type
    string
    Description

    Specifies the SQL command used to create a new table in a database. This command includes the table name and the definition of its columns and their data types, e.g., CREATE TABLE table_name (column1 datatype1, column2 datatype2, ...);.

  • Name
    CHAR
    Type
    string
    Description

    Specifies the use of the CHAR data type for columns where the length of the string is fixed, such as a country code (e.g., 'US', 'CA'). CHAR is more space-efficient when you know the exact length of the data to be stored.

  • Name
    VARCHAR
    Type
    string
    Description

    Specifies the use of the VARCHAR data type for columns that will store strings of variable length. It is ideal for data like names, emails, and addresses where the length can vary.

  • Name
    PRIMARY_KEY
    Type
    string
    Description

    Defines a column or a set of columns that uniquely identifies each row in a table. It is crucial for ensuring data integrity and is often used as an index to enhance the performance of queries that access the table.

Select, Export, View

  • Name
    \dt
    Type
    string
    Description

    Displays the list of relations (tables, sequences, views, etc.) in the database. The command \dt is typically used in the psql interactive terminal to view all available tables and relations in the current database.

  • Name
    SELECT_Command
    Type
    string
    Description

    The SELECT command is essential for querying and retrieving data from a database. It is used in almost all SQL operations to select data from tables, and it allows the user to specify columns, conditions, and other clauses.

  • Name
    Exporting_Results
    Type
    string
    Description

    Exporting query results into a file is particularly useful when you need to process or analyze your data outside the database, such as for reporting or further trend analysis. PostgreSQL allows you to export data in various formats like CSV or plain SQL, facilitating data manipulation and sharing.

Creating Table

CREATE TABLE users (
  user_id SERIAL PRIMARY KEY,
  first_name VARCHAR(50),
  last_name VARCHAR(50),
  country_code CHAR(2)
);

Insert Values

  INSERT INTO users
    (first_name,
    last_name,
    country_code)
  VALUES
    ('Alice', 'Smith', 'GB'),
    ('Bob', 'Johnson', 'CA'),
    ('Charlie', 'Brown', 'AU'),
    ('David', 'Davis', 'US'),
    ('Emma', 'Garcia', 'MX'),
    ('Fiona', 'Martinez', 'ES'),
    ('George', 'Miller', 'US'),
    ('Hannah', 'Wilson', 'NZ'),
    ('Ivan', 'Taylor', 'RU'),
    ('Julia', 'Anderson', 'SE');

Select All

SELECT * FROM users;

Export Selected

COPY (SELECT * FROM users)
TO '/path/to/your/file.csv'
WITH CSV HEADER;

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