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Data Types
This section covers ClickHouse data types in detail: numeric types, strings, dates, and special types. Learn the rules and when to use each type.
What you'll learn
- Data Type Rules: Fundamental principles for choosing the right data types
- Numeric Types: Signed and unsigned integers, floats, decimals, and precision considerations
- String Types: FixedString, LowCardinality, and compression strategies
- Date and Time: Date, Date32, DateTime, DateTime64, and time zone handling
- Specialized Types: Enum, IPv4/IPv6, Boolean, and when to use each
- Nullable Columns: When to use Nullable and performance implications
- Complex Types: Arrays, Maps, Tuples, JSON, and AggregateFunction types