Study resource

Structured Query Language (SQL) common mistakes

Study Structured Query Language (SQL) with curriculum-aligned Common Mistakes resources, practice links, and exam-focused support.

At a glance

common mistakes

Resource type

Topic

Structured Query Language (SQL)

AqaA LevelComputer ScienceFundamentals of databases

Common mistakes

Updating or deleting every row
Writing UPDATE or DELETE without a suitable WHERE condition.
Fix itUse WHERE to identify the intended row or rows, for example: DELETE FROM Customer WHERE CustomerID = 45;