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create table page_layout
(
   page_layout_id   number(38) not null,
   layout_name      varchar2(50) not null,
   display_name     varchar2(50) not null,
   num_regions      number(10) not null,
   render_seq       number(10) not null,
   user_selectable varchar2(1) not null,
   constraint page_layout_pk 
        primary key (page_layout_id),
   constraint unq_page_layout_layout_name 
        unique (layout_name),
   constraint unq_page_layout_display_name 
        unique (display_name),
   constraint unq_page_layout_render_seq 
        unique (render_seq),
   constraint chk_page_layout_selectable
        check (user_selectable in ('Y','N'))              
);