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Welcome to the world of SQL, Structured Query Language, a ubiquitous language adopted in data management and programming. This blog post will serve as a comprehensive starter guide for anyone aspiring to learn SQL and know the most fundamental SQL commands with their basic syntax.
1. What is SQL?
SQL, the acronym for Structured Query Language, is a standard language specifically designed for managing data in Relational Database Management Systems (RDBMS).
2. Basic SQL Statements
a. SELECT
The SELECT statement is used to retrieve data from a database. The data returned is called a result-set. Here is a basic example:
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SELECT column_name FROM table_name; |
This code will return all data in the column_name from the table_name.
b. UPDATE
The UPDATE statement is used to modify an existing record in a table. An example of the UPDATE statement can be:
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UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition; |
The code above will update values in the columns with new ones where the specified condition is true.
c. DELETE
The DELETE statement is used to delete existing records in a table. Here is an example:
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DELETE FROM table_name WHERE condition; |
This code will delete all records from the table_name where the condition is met.
3. Conclusion
Starting from fundamentals always gives a solid base. By learning how to use SELECT, UPDATE, and DELETE, you have begun your journey into the productive world of SQL. Keep practicing, and the ability to manipulate databases will come naturally.
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