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- Subqueries 11228
- Subqueries are parenthesized query expressions that appear as part of a larger, outer query. Subqueries are usually based on SELECT ... FROM , but in DuckDB other query constructs such as PIVOT can also appear as a subquery. Scalar Subquery
...when the subquery returns one or more records, and false otherwise. The EXISTS operator is generally the most useful as a correlated subquery to express semijoin operations. However, it can be used as an uncorrelated subquery as well. For example, we can...when the subquery returns an empty result, and false otherwise. The NOT EXISTS operator is generally the most useful as a correlated subquery to express antijoin operations. For example, to find Person nodes without an interest: CREATE TABLE Person (id BI...we used the EXISTS operator: SELECT 'Math' IN (SELECT course FROM grades) AS math_grades_present; math_grades_present true Correlated Subqueries All the subqueries presented here so far have been uncorrelated subqueries, where the subqueries themselves are... - https://man.mtool.work/duckdb/2.0/sql/expressions/subqueries.html
- FROM and JOIN Clauses 7485
- 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
...al join . SELECT * FROM range(3) t(i), LATERAL (SELECT i + 1) t2(j); i j 0 1 2 3 1 2 Lateral joins are a generalization of correlated subqueries, as they can return multiple values per input value rather than only a single value. SELECT * FROM generate_ser... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/from.html
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