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SQLite Tutorial - Common Commands

SQLite is a lightweight, embedded relational database that provides an efficient way to store and access data. In this tutorial, we will cover some of the most common SQLite commands that you will need to work with SQLite databases.

Syntax

The basic syntax for executing SQLite commands is as follows:

command;

In most cases, you will need to issue commands from a command-line interface or using a GUI tool such as DB Browser for SQLite.

Example

Here are some examples of common SQLite commands:

  • To create a new table:
CREATE TABLE table_name (
    column1 datatype PRIMARY KEY,
    column2 datatype NOT NULL,
    column3 datatype
);
  • To insert data into a table:
INSERT INTO table_name (column1, column2, column3)
VALUES (value1, value2, value3);
  • To select data from a table:
SELECT column1, column2, ...
FROM table_name
WHERE condition;
  • To update data in a table:
UPDATE table_name
SET column1 = new_value1
WHERE condition;
  • To delete data from a table:
DELETE FROM table_name
WHERE condition;
  • To drop a table:
DROP TABLE table_name;

Output / Explanation

The output of these commands will depend on the specific query that you run. For example, a SELECT statement will return the data that matches the specified condition, while a DROP TABLE command will simply delete the specified table.

Use

These commands can be used for creating, inserting, selecting, updating, and deleting data from an SQLite database. They are essential for managing databases, configuring schemas, and performing CRUD (Create, Read, Update, Delete) operations on data.

Important Points

  • All SQLite commands should be terminated with a semicolon (;).
  • Column names and data types should be defined when creating a table.
  • Primary keys are used to uniquely identify each row in a table.
  • Use the WHERE clause in SELECT, UPDATE, and DELETE statements to specify the condition for selecting, updating, or deleting data.
  • Always use caution when deleting data from a table, as it is irreversible.
  • Use the appropriate data types when inserting data into a table.
  • SQL commands are case-insensitive but standard practice is to capitalize them for readability.

Summary

In this tutorial, we learned about some of the most common SQLite commands that are used for creating, inserting, selecting, updating, and deleting data from an SQLite database. We also learned about the importance of defining columns and data types, using primary keys to uniquely identify rows, and using the WHERE clause to specify conditions for selecting data. These commands are essential for managing databases and performing CRUD operations on data.

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