Creating SQL databases and tables

The above given query is a set of SQL statements that creates a database called "sql_invoicing" and defines several tables within it, including "payment_methods," "clients," "invoices," and "payments."

The "payment_methods" table stores different payment methods with their corresponding IDs and names. The "clients" table stores client information such as client IDs, names, addresses, cities, states, and phone numbers. The "invoices" table stores invoice details, including invoice IDs, numbers, client IDs, invoice totals, payment totals, invoice dates, due dates, and payment dates. The "payments" table stores payment information, including payment IDs, client IDs, invoice IDs, payment dates, amounts, and payment methods.

The second part of the query drops the existing "sql_store" database if it exists and creates a new database called "sql_store." Within this database, it creates the "products," "shippers," "customers," "order_statuses," and "orders" tables.

The "products" table stores product information, including product IDs, names, quantities in stock, and unit prices. The "shippers" table stores shipper information with shipper IDs and names. The "customers" table stores customer details, including customer IDs, first names, last names, birth dates, phone numbers, addresses, cities, states, and loyalty points. The "order_statuses" table stores different order statuses with their IDs and names. The "orders" table stores order information, including order IDs, customer IDs, order dates, order statuses, comments, shipped dates, and shipper IDs.

Each table is created with specified column names, data types, and constraints such as primary keys and foreign keys. The INSERT statements are used to populate the tables with sample data.

Overall, the query sets up two databases, "sql_invoicing" and "sql_store," and creates multiple tables with their respective columns and relationships. It also inserts sample data into these tables.