tables are one of the key components of an SQLite database. A table is a collection of data organized into rows and columns, much like a spreadsheet. Each row in an SQLite table represents a record or instance of data, while each column represents a field or attribute of that data.
SQLite tables are created using the SQL (Structured Query Language)
CREATE TABLE statement. This statement defines the columns of the table, their data types, and any constraints that should be applied to the data.
For example, to create a simple table with two columns named “id” and “name”, where “id” is an integer and “name” is a text field, the following SQL statement can be used:
CREATE TABLE my_table ( id INTEGER PRIMARY KEY, name TEXT );
PRIMARY KEY constraint on the id column indicates that this column should be the primary key for the table, which means that each row must have a unique value for this column. The TEXT data type is used for the name column, indicating that it will store text values.
Once a table has been created, data can be added to it using the SQL
INSERT statement. For example:
INSERT INTO my_table (id, name) VALUES (1, 'John'); INSERT INTO my_table (id, name) VALUES (2, 'Jane');
These statements insert two rows into the my_table table, with the values “1” and “John” in the first row, and “2” and “Jane” in the second row.
SQLite tables can also be queried using the SQL
SELECT statement to retrieve specific data from the table. For example:
SELECT name FROM my_table WHERE id = 1;
This statement selects the name column from the my_table table where the id column is equal to 1, and returns the value “John”.
In summary, SQLite tables are a fundamental part of an SQLite database. They allow data to be organized into rows and columns, and can be created, modified, and queried using SQL statements.