reaanb questions

reaanb answers

• Can an entity have multiple primary keys? ER Model
• Why we don't draw ER for NoSQL databses
• Deciphering Database ER Diagram for questionnaire
• What data type should I use for a 'duration' attribute?
• Convert ternary relationship to binary in E/R model
• How to show composite keys in Chen E-R Diagram
• Determine the closest free set of X/Y coordinates within an ever expanding 2D grid stored in MySQL
• Easiest way to compare two files with lists of song titles
• Best practices to enable/disable/delete database rows and its references?
• is optionality (mandatory, optional) and participation (total, partial) are same?