.............................................................................. 680 RDB$SECURITY_CLASSES ................................................................................................ Запрос с двумя подзапросами: SELECT p.fullname, (SELECT name FROM classes c WHERE c.id = p.class) AS class, (SELECT name FROM mentors m WHERE m.id = p.mentor) AS вместо подзапросов: SELECT p.fullname, c.name AS class, m.name AS mentor FROM pupils p JOIN classes c ON c.id = p.class JOIN mentors m ON m.id = p.mentor

@enduml 3.16 Remove classes You can also use the remove commands to remove classes. This may be useful if you define a large !included file, and if you want to remove some classes after file inclusion or Remove unlinked class By default, all classes are displayed: @startuml class C1 class C2 class C3 C1 -- C2 @enduml But you can: • hide @unlinked classes: @startuml class C1 class C2 class C3 C1 C1 -- C2 hide @unlinked @enduml • or remove @unlinked classes: @startuml class C1 class C2 class C3 C1 -- C2 remove @unlinked @enduml Справочное руководство по языку PlantUML (1.2021.2) 63 / 387 3

@enduml 3.16 Remove classes You can also use the remove commands to remove classes. This may be useful if you define a large !included file, and if you want to remove some classes after file inclusion or Remove unlinked class By default, all classes are displayed: @startuml class C1 class C2 class C3 C1 -- C2 @enduml But you can: • hide @unlinked classes: @startuml class C1 class C2 class C3 C1 C1 -- C2 hide @unlinked @enduml • or remove @unlinked classes: @startuml class C1 class C2 class C3 C1 -- C2 remove @unlinked @enduml Справочное руководство по языку PlantUML (1.2021.1) 63 / 382 3

@enduml 3.16 Remove classes You can also use the remove commands to remove classes. This may be useful if you define a large !included file, and if you want to remove some classes after file inclusion or Remove unlinked class By default, all classes are displayed: @startuml class C1 class C2 class C3 C1 -- C2 @enduml But you can: • hide @unlinked classes: @startuml class C1 class C2 class C3 C1 C1 -- C2 hide @unlinked @enduml • or remove @unlinked classes: @startuml class C1 class C2 class C3 C1 -- C2 remove @unlinked @enduml Справочное руководство по языку PlantUML (1.2021.2) 64 / 405 3

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml

классов Sometimes, the default layout is not perfect... You can use together keyword to group some classes together : the layout engine will try to group them (as if they were in the same package). You can other elements you may get a syntax error if, for example, trying to add a rectangle along with classes. In those cases, add { and } after the macro to create the empty rectangle. Example of usage: @startuml