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Database Migrations Explained: Change a Live Database Safely
A database migration is a small, numbered file that changes a database's structure, such as adding a column, and is kept in the code r...
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System Design
Database Migrations Explained: Change a Live Database Safely
A database migration is a small, numbered file that changes a database's structure, such as adding a column, and is kept in the code r...
Chemistry
What is a mole in chemistry? Avogadro's number explained
A mole is a number of particles, the way a dozen means 12. One mole is 6.02 × 10 23 particles (atoms, molecules or charged ions). That nu...
System Design
Database Indexing Explained: How an Index Makes SQL Fast
A database index is a separate, sorted list of one or more columns that points to the full rows. The database searches that smaller sorted...