SELECT COUNT(*) FROM USER_TAB_COLUMNS WHERE TABLE_NAME=UPPER(''''legalentity'''')

MYSQL中的外键：

/*==============================================================*/
/* DBMS name:      MySQL 4.0                                    */
/* Created on:     2005-8-9 16:38:37                            */
/*==============================================================*/

drop table if exists Article;

drop table if exists Board;

drop table if exists User;

/*==============================================================*/
/* Table: Article                                               */
/*==============================================================*/
create table Article
(
   id                             int                            not null  primary key,
   parent_id                      int,
   index(parent_id),
   foreign key (parent_id) references Article (id) ,
   board_id                       int                            not null,
   index(board_id),
   foreign key (board_id) references Board (id) ,
   article_type                   int                            not null,
   title                          varchar(255)                   not null,
   body                           text,
   create_by                      int                            not null,
   index(create_by),
   foreign key (create_by) references User (id)  ,  
   create_time                    datetime                       not null,
   hits                           int                            not null,
   bytes                          int,
   last_update_by                 int                            not null,
   index(last_update_by),
   foreign key (last_update_by)  references User (id),
   last_update_time               datetime                       not null,
)
type = InnoDB;

/*==============================================================*/
/* Table: Board                                                 */
/*==============================================================*/
create table Board
(
   id                             int                            not null    primary key,
   create_by                      int                            not null,
   index(create_by),
   foreign key (create_by)  references User (id),
   parent_id                      int,
   index(parent_id),
   foreign key (parent_id)  references  Board (id),
   name                           varchar(50)                    not null,
   remark                         varchar(255),
   create_time                    datetime                       not null,
)
type = InnoDB;

/*==============================================================*/
/* Table: User                                                  *

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