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- SQL Introduction 11643
- This page provides an overview of how to perform simple operations in SQL. This tutorial is only intended to give you an introduction and is in no way a complete tutorial on SQL. This tutorial is adapted from the PostgreSQL tutorial . DuckD
...he part that lists the tables from which to retrieve the data), and an optional qualification (the part that specifies any restrictions). For example, to retrieve all the rows of table weather, type: SELECT * FROM weather; Here * is a shorthand for “all col...ork since the aggregate max cannot be used in the WHERE clause: Binder Error: WHERE clause cannot contain aggregates! This restriction exists because the WHERE clause determines which rows will be included in the aggregate calculation; so obviously it has t...the other hand, the HAVING clause always contains aggregate functions. In the previous example, we can apply the city name restriction in WHERE , since it needs no aggregate. This is more efficient than adding the restriction to HAVING , because we avoid do... - https://man.mtool.work/duckdb/2.0/sql/introduction.html
- JSON Type 10766
- DuckDB supports json via the JSON logical type. For example: SELECT '[1, null, {"key": "value"}]'::JSON; [1, null, {"key": "value"}] Logically, the JSON type is similar to a VARCHAR , but with the restriction that it must be valid JSON. Phy
... - https://man.mtool.work/duckdb/2.0/data/json/json_type.html
- IN Operator 10309
- The IN operator checks containment of the left expression inside the collection on the right hand side (RHS). Supported collections on the RHS are tuples, lists, and maps, as well as subqueries that return a single column. The single-column
...restriction applies only to subqueries; tuples, lists, and maps may themselves contain composite values. IN (val1, val2, ...) (Tuple)... - https://man.mtool.work/duckdb/2.0/sql/expressions/in.html
- ATTACH and DETACH Statements 7640
- DuckDB allows attaching to and detaching from database files. Examples Attach the database file.db with the alias inferred from the name ( file ): ATTACH 'file.db'; Attach the database file.db with an explicit alias ( file_db ): ATTACH 'fil
...s already modified database "db1" - a single transaction can only write to a single attached database. The reason for this restriction is that the system does not maintain atomicity for transactions across attached databases. Transactions are only atomic wi... - https://man.mtool.work/duckdb/2.0/sql/statements/attach.html
- Geometry Data Type 7202
- Name Description GEOMETRY Geospatial entity The GEOMETRY data type is used to store and manipulate geometric objects, such as points, lines, and polygons. The GEOMETRY type was part of the spatial extension but became a built-in data type i
...tem 'DUCK:1337' when trying to create GEOMETRY type The coordinate system definition may be incomplete or invalid ... This restriction exists because DuckDB needs the complete CRS definition, not just an identifier, to perform coordinate transformations and... - https://man.mtool.work/duckdb/2.0/sql/data_types/geometry.html
- DuckDB_% Metadata Functions 7202
- DuckDB offers a collection of table functions that provide metadata about the current database. These functions reside in the main schema and their names are prefixed with duckdb_ . The resultset returned by a duckdb_ table function may be
...ier of the column data type. BIGINT character_maximum_length Always NULL . DuckDB text types do not enforce a value length restriction based on a length type parameter. INTEGER numeric_precision The number of units (in the base indicated by numeric_precisio... - https://man.mtool.work/duckdb/2.0/sql/meta/duckdb_table_functions.html
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