A constraint is a rule that is applied to a column in a table to ensure that the data in the column meets certain requirements. There are several types of constraints in SQL, including NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN ...Read more
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To open a popup modal using Bootstrap, you’ll need to include the Bootstrap CDN and the necessary JavaScript code in your HTML file. Here are the steps:Include the Bootstrap CSS and JS files in the head section of your HTML ...Read more
If you accidentally added a file or files using git add that you didn’t intend to include in your commit, you can undo the add operation by using the following command: git reset <file> Replace <file> with the name of the file ...Read more
No, JSON does not support comments. According to the official JSON specification, comments are not allowed in JSON files. Any comments included in a JSON file will result in a syntax error when the file is parsed. However, you can ...Read more
A foreign key is a column or set of columns in a table that refers to the primary key of another table. It is used to establish a relationship between two tables.When we study databases, one important idea is ...Read more
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A transaction is a set of SQL statements that are executed as a single unit of work. It allows multiple changes to be made to the database in a way that ensures data integrity.