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- Logical Operators 10789
- The following logical operators are available: AND , OR and NOT . SQL uses a three-valued logic system with true , false and NULL . Note that logical operators involving NULL do not always evaluate to NULL . For example, NULL AND false will
...NOT a true false false true NULL NULL The operators AND and OR are commutative, that is, you can switch the left and right operand without affecting the result.... - https://man.mtool.work/duckdb/2.0/sql/expressions/logical_operators.html
- Profiling 10417
- Profiling is essential to help understand why certain queries exhibit specific performance characteristics. DuckDB contains several built-in features to enable query profiling, which this page covers. For a high-level example of using EXPLA
...y Plans In query plans, the hash join operators adhere to the following convention: the probe side of the join is the left operand, while the build side is the right operand. Join operators in the query plan show the join type used: Inner joins are deno... - https://man.mtool.work/duckdb/2.0/dev/profiling.html
- Expression API 6678
- The Expression class represents an instance of an expression . Why Would I Use the Expression API? Use expressions to build filters and computed columns in Python. They are useful when column names or conditions depend on your code. import
...if col("a") == 1: , raises TypeError: an expression has no truth value; combine with & | ~, and test with .is_null() . An operand that is neither an expression nor a value also raises a TypeError . Below is a list of currently supported expressions tha... - https://man.mtool.work/duckdb/2.0/clients/python/expression.html
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