"`SELECT (SELECT TOP 1) FROM` is not supported by Jet." --- "Can be supported after rearranging CROSS JOIN/JOIN expressions." Currently, the following SQL is generated: SELECT FROM (`Orders` AS `o`, `Orders` AS `o0`) LEFT JOIN `Customers` AS `c` ON `o`.`CustomerID` = `c`.`CustomerID`) LEFT JOIN `Customers` AS `c0` ON `o0`.`CustomerID` = `c0`.`CustomerID` However, the following SQL is needed for Access to understand the query: SELECT FROM Orders AS o LEFT JOIN Customers AS c ON o.CustomerID = c.CustomerID, Orders AS o0 LEFT JOIN Customers AS c0 ON o0.CustomerID = c0.CustomerID The same is true for INNER JOINs as well. --- [Fact(Skip = "Probably unsupported by JET")] [Fact(Skip = "Unsupported by JET")] [Fact(Skip = "Unsupported by JET: subqueries supported only in FROM clause")] [Fact(Skip = "Unsupported by JET: SELECT TOP 2 (SELECT TOP 1) returns 2 records")] [Fact(Skip = "Unsupported by JET: SELECT ORDER BY (SELECT)")] [Fact(Skip = "Unsupported by JET: SKIP TAKE is supported only in outer queries")] [Fact(Skip = "Unsupported by JET: too complex query with DUAL")] [Fact(Skip = "Unsupported by JET: DateTime does not support milliseconds")] [Fact(Skip = "Unsupported by JET: SKIP TAKE DISTINCT")] [Fact(Skip = "Assertion failed without evident reason")] [Fact(Skip = "Unsupported by JET: Guid are supported indirectly")] [Fact(Skip = "Unsupported by JET: Should be implemented by provider")] [Fact(Skip = "Unsupported by JET: DateTimeOffset not fully supported")] [Fact(Skip = "Unsupported by JET: CROSS JOIN and OTHER JOIN")] [Fact(Skip = "Unsupported by JET: JOIN with unsupported ON PREDICATE")] [Fact(Skip = "Unsupported by JET: operators on IMAGE and TEXT data types are not supported")] [Fact(Skip = "Unsupported by JET: Data type unsupported")] [Fact(Skip = "Unsupported by JET: rowversion unsupported")] [Fact(Skip = "Unsupported by JET: nullable bit not supported")] [Fact(Skip = "Unsupported by JET: JET behaviour requires that both columns in a composite foreign key are null")] [Fact(Skip = "Unsupported by JET: OleDB does not support parallel transactions")]