- CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, SET.
- They make your database size much larger and hurt query performance.
- INT, FLOAT, DOUBLE, DECIMAL, BIT.
- Use this when you are concerned about the upper bounds of the range on your INT.
- DATE, TIME, DATETIME, TIMESTAMP, YEAR.
- Oracle, PostgreSQL, and SQL Server.
- JSON and spatial data types.
- You want to pick the smallest data type that will hold your data so that you can have the fastest query performance.
- TINYINT.
- VARCHAR.
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