@startuml

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state Query

state Create
Create : Create database table
state Drop
Drop : Drop database table
state Select
Select: Query rows
Select: Add columns
state Insert
Insert: Insert rows
state Update
Update: Update rows
Update: Set table name
state Delete
Delete: Delete items from table

state Table
Table: Set table name
state Into
Into: Set table name
Into: Add columns
state From
From: Set table name

state Join
Join: Set table
Join: Set join type (inner left, right, outer)
state Where
Where: Add where clause
state Set
Set: Set column value pairs
state Values
Values: Set values

state On:
On: Set Expression

state GroupBy
GroupBy: Add column names
state OrderBy
OrderBy: Add expression
state Limit
Limit: Add number of max result elements

[*] --> Query
Query --> Create
Query --> Drop
Query --> Select
Query --> Insert
Query --> Update
Query --> Delete

Create --> Table
Drop --> Table
Select --> From
Insert --> Into
Delete --> From

Into --> Values
Update --> Set
Set -> Where
From --> Where
From --> OrderBy
From --> GroupBy
From --> Join
Join --> On
On --> Where

Where --> GroupBy
Where --> OrderBy
Where --> Limit

GroupBy --> OrderBy
OrderBy --> Limit

Table --> [*]
Values ---> [*]
Where --> [*]
Set --> [*]
From --> [*]
Limit --> [*]
OrderBy --> [*]
GroupBy --> [*]

@enduml