Search results for: "previous records"

What is the best practice for checking if a record already exists before adding a new entry in PHP without using the primary key as a criterion?

When checking if a record already exists before adding a new entry in PHP without using the primary key as a criterion, you can use a unique field in...

What are the considerations when deciding between deleting and re-importing data from a .csv file into a MySQL database using PHP?

When deciding between deleting and re-importing data from a .csv file into a MySQL database using PHP, consider the size of the dataset, the frequency...

How can the use of varchar data type in MySQL affect PHP code functionality?

When using the varchar data type in MySQL, it is important to ensure that the length of the varchar field matches the length of the corresponding vari...

What potential pitfalls should be considered when using LIMIT in PHP?

When using LIMIT in PHP to retrieve a subset of records from a database, it is important to consider the potential pitfalls of not properly handling t...

How can the SUBSTRING function be used in SQL queries to filter results based on specific criteria in PHP?

To filter results based on specific criteria using the SUBSTRING function in SQL queries in PHP, you can use the SUBSTRING function within the WHERE c...