小编See*_*erC的帖子

我正在使用 PostgreSQL 10。我想要一个表，允许在列中使用相同的值，但不允许在行中使用。我创建的表：

CREATE TABLE teams
(
  team_id SERIAL PRIMARY KEY
  team_lead character varying(250) NOT NULL,  
  member1 character varying(250) NOT NULL,
  member2 character varying(250),
  member3 character varying(250)
  )

这将被允许：

CREATE TABLE teams
(
  team_id SERIAL PRIMARY KEY
  team_lead character varying(250) NOT NULL,  
  member1 character varying(250) NOT NULL,
  member2 character varying(250),
  member3 character varying(250)
  )

这不会：

| team_lead     |  member1     | member2       |
------------------------------------------------
| Jane Doe      | Bill Smith   | Shirley Green |
| Jane Doe      | Carol Lewis  | …