SQL BASIC QUERIES YOU NEED TO KNOW PART 1

SQL (Structured Query Language) is a programming language used for managing and manipulating relational databases. It is used to insert, update, and retrieve data from a database.

Here are some basic examples of SQL commands:

SELECT: The SELECT statement is used to retrieve data from one or more tables in a database.

The basic syntax for a SELECT statement is:

SELECT column1, column2, ...
FROM table_name
WHERE some_column = some_value;

• The SELECT clause specifies the columns that you want to retrieve. You can specify one or more columns by separating them with a comma. You can also use the wildcard character * to select all columns.
• The FROM clause specifies the table from which you want to retrieve data. You can specify one or more tables by separating them with a comma, but you would need to use aliases to distinguish the columns coming from different tables.
• The WHERE clause is used to filter the rows based on certain conditions. It specifies one or more conditions that must be met for a row to be included in the result set.

Let’s consider an example where we have two tables “customers” and “orders”