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- Union Type 12445
- A UNION type (not to be confused with the SQL UNION operator ) is a nested type capable of holding one of multiple “alternative” values, much like the union in C. The main difference is that these UNION types are tagged unions and thus alwa
...ON can also be implicitly cast to another UNION if the source UNION members are a subset of the target's (if the cast is unambiguous). UNION uses the member types' VARCHAR cast functions when casting to VARCHAR : SELECT u FROM tbl1; u 1 two three Select a...→ UNION(i INTEGER, v VARCHAR) cast will always cast the FLOAT to the INTEGER member before VARCHAR . If the cast still is ambiguous, i.e., there are multiple candidates with the same implicit casting priority, an error is raised. This usually happens whe...n the UNION contains multiple members of the same type, e.g., a FLOAT → UNION(i INTEGER, num INTEGER) is always ambiguous. So how do we disambiguate if we want to create a UNION with multiple members of the same type? By using the union_value f... - https://man.mtool.work/duckdb/2.0/sql/data_types/union.html
- Struct Data Type 8173
- Conceptually, a STRUCT column contains an ordered list of columns called “entries”. The entries are referenced by name using strings. This document refers to those entry names as keys. Each row in the STRUCT column must have the same keys.
...ruct columns and non-aggregate expressions. Dot Notation Order of Operations Referring to structs with dot notation can be ambiguous with referring to schemas and tables. In general, DuckDB looks for columns first, then for struct keys within columns. Duc... - https://man.mtool.work/duckdb/2.0/sql/data_types/struct.html
- FROM and JOIN Clauses 8173
- The FROM clause specifies the source of the data on which the remainder of the query should operate. Logically, the FROM clause is where the query starts execution. The FROM clause can contain a single table, a combination of multiple table
...e name without aliases will result in an error: CREATE TABLE t (x INTEGER); SELECT * FROM t JOIN t USING(x); Binder Error: Ambiguous reference to table "memory.main.t" (duplicate alias "memory.main.t", explicitly alias one of the tables using "AS my_alias... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/from.html
- ATTACH and DETACH Statements 8173
- 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
...ests that a fully qualified path is used instead: CREATE SCHEMA new_db; CREATE TABLE new_db.tbl (i INTEGER); Binder Error: Ambiguous reference to catalog or schema "new_db" - use a fully qualified path like "memory.new_db" Changing the Catalog Search Path... - https://man.mtool.work/duckdb/2.0/sql/statements/attach.html
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