Deleting Earliest Incomplete or Brief Exam Records Using MySQL DELETE with ORDER BY and LIMIT
Consider an exam record table exam_record that logs user attempts over several year. The table has the folowing structure:
Field
Type
Null
Key
Extra
Default
Comment
id
int(11)
NO
PRI
auto_increment
(NULL)
Auto-increment ID
uid
int(11)
NO
(NULL)
User ID
exam_id
int(11)
NO
(NULL)
Exam ID
start_time
datetime
NO
(NULL)
Start time ...
Posted on Fri, 14 Aug 2026 16:06:04 +0000 by stonelord
SQL Query Fundamentals: SELECT, WHERE, Aggregation, Grouping, Sorting, and Limiting
This document covers essential SQL query operations, including selectign data, filtering with conditions, aggregating results, grouping data, ordering output, and limiting the number of rows returned.
Basic SELECT Syntax
The fundamental SELECT statement retrieves data from a table. The * wildcard selects all columns, while specific column names ...
Posted on Thu, 28 May 2026 22:12:24 +0000 by merkinmuffley