Set data type

When to use

• Enforce uniqueness of elements

• Creating relationship between other entity
  

• Common elements between other entity
  
• Guarantee operation idempotence
• Order of elements doesn’t matter.
  ex) ip black list.

Tips

Why do we need store operation?

• SINTERSTORE
• SDIFFSTORE
• SUNIONSTORE

Reduce the number of execution those operation.
Those operations’ cost is expensive.