     // - ==(SQLSpecificExpressible, SQLSpecificExpressible)
 }
 
+extension SQLSpecificExpressible {
+    public var sqlSelection: SQLSelection {
+        .expression(sqlExpression)
+    }
+    
+    public var sqlOrdering: SQLOrdering {
+        .expression(sqlExpression)
+    }
+}
+
 extension SQLExpression: SQLSpecificExpressible {
     // Not a real deprecation, just a usage warning
     @available(*, deprecated, message: "Already SQLExpression")

/// like `Column`.
///
/// See https://github.com/groue/GRDB.swift/#the-query-interface
public protocol SQLExpressible: SQLSelectable, SQLOrderingTerm {
    /// Returns an SQL expression.
    var sqlExpression: SQLExpression { get }
}

extension SQLExpressible {
    public var sqlSelection: SQLSelection {
        .expression(sqlExpression)
    }
    
    public var sqlOrdering: SQLOrdering {
        .expression(sqlExpression)
    }
}

/// `SQLSpecificExpressible` is a protocol for all database-specific types that

/// and it adopts `SQLSpecificExpressible`.
///
/// On the other side, `Int` adopts `SQLExpressible`.
public protocol SQLSpecificExpressible: SQLExpressible, SQLSelectable, SQLOrderingTerm {
    // SQLExpressible can be adopted by Swift standard types, and user
    // types, through the DatabaseValueConvertible protocol which inherits
    // from SQLExpressible.
