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chat-space's Introduction

Explanations for DB construcure

tables and columns

messages table

column type constraint index
content string not null add
image string
group_id references not null , foreign key
user_id references not null , foreign key

groups table

column type constraint index
name string not null

users table

column type constraint index
name string not null
email string not null, unique
password string not null

users_groups table

column type constraint index
user_id references not null, foreign key
group_id references not null, foreign key

Association

User <- Users_group ->Group User -> Message Group -> Message

chat-space's People

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