AQA SQL L2

Recap Key Terms SQL

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A collection of information stored together in a structured and organised way

Databases are arranged using tables, records and fields

Each record has a fields that uniquely identifies (separates) that record from others. This is the primary key

• Repeated data (duplication)

• Greater chance for inaccuracy

• Increases data entry time

• Reduced data integrity (trust in data and query results)

• Easy to create

• Data stored and inputted once

• Can setup access rights for individual tables

• New tables or fields can be added without affecting other tables

• Difficult to setup with specialised software required

• Primary key is a field within a table that uniquely identifies each row

• Foreign key is a field that references the primary key of another table

The INSERT INTO statement is used to insert new records in a table.

INSERT INTO Syntax It is possible to write the INSERT INTO statement in two ways.

The first way specifies both the column names and the values to be inserted

If you are adding values for all the columns of the table, you do not need to specify the column names in the SQL query. However, make sure the order of the values is in the same order as the columns in the table. The INSERT INTO syntax would be as follows:

The SQL DELETE Statement

The DELETE statement is used to delete existing records in a table.

​DELETE Syntax

​ DELETE FROM table_name WHERE condition;

​DELETE Syntax

​ DELETE FROM table_name WHERE condition;

Warning with ​DELETE

Warning with ​DELETE