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https://www.tutorialspoint.com/sqlite/sqlite_sub_queries.htm
SQLite - Subqueries. A Subquery or Inner query or Nested query is a query within another SQLite query and embedded within the WHERE clause. A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved.
https://www.techonthenet.com/sqlite/subqueries.php
In SQLite, a subquery is a query within a query. You can create subqueries within your SQL statements. These subqueries can reside in the WHERE clause, the FROM clause, or the SELECT clause.
https://www.w3resource.com/sqlite/sqlite-subqueries.php
SQLite subquery is a SELECT query that is embedded in the main SELECT statement. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. Also subqueries with EXISTS or NOT EXISTS, Correlated Subqueries and Subqueries in the FROM Clause.
https://stackoverflow.com/questions/54852326/does-sqlite-support-join-in-delete-clause
SQLite does not support the join construct which MySQL does. However, you may still rephrase your query using a correlated subquery, e.g. DELETE FROM WorkRecord2 w WHERE EXISTS (SELECT 1 FROM Employee e WHERE w.EmployeeRun = e.EmployeeNo AND e.Company = '1') AND Date = '2013-05-06';
https://support.office.com/en-ie/article/sql-subqueries-d41fc0b1-1c88-40d4-bbd1-951de6e94e2a
In a subquery, you use a SELECT statement to provide a set of one or more specific values to evaluate in the WHERE or HAVING clause expression. Use the ANY or SOME predicate, which are synonymous, to retrieve records in the main query that satisfy the comparison with any records retrieved in the subquery.
http://support.sas.com/documentation/cdl/en/sqlproc/62086/HTML/default/a001361644.htm
The subquery does another self-join and calculates the minimum distance between city A1 and all other cities in the table other than city A1. The outer query tests to see whether the distance between cities A1 and B2 is equal to the minimum distance that was calculated by the subquery.
https://stackoverflow.com/questions/33933118/does-sparksql-support-subquery
It simply doesn't support subqueries in the WHERE clause.Generally speaking arbitrary subqueries (in particular correlated subqueries) couldn't be expressed using Spark without promoting to Cartesian join.
https://databricks.com/blog/2016/06/17/sql-subqueries-in-apache-spark-2-0.html
A subquery is a query that is nested inside of another query. A subquery as a source (inside a SQL FROM clause) is technically also a subquery, but it is beyond the scope of this post. There are basically two kinds of subqueries: scalar and predicate subqueries.
https://sqlite.org/lang_with.html
What really happens is that the query optimizer sees that values in the "cnt" recursive table are only used once. So as each row is added to the recursive table, that row is immediately returned as a result of the main SELECT statement and then discarded. SQLite does not accumulate a temporary table containing...
https://sqlite.org/omitted.html
Rather than try to list all the features of SQL that SQLite does support, it is much easier to list those that it does not. Unsupported features of SQL are shown below. See also the Quirks, Caveats, and Gotchas of SQLite. RIGHT and FULL OUTER JOIN LEFT OUTER JOIN is …
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