SPACED REVIEW
Can you bring it back to mind?
Try to answer before you turn the card. Recalling is part of learning.
Data representations · NEW
Does an allowed NULL value remove a relational table’s declared schema?
Say it aloud, write it down, or picture an example.
Space it out, don’t cram it in.
Known cards return in 1, 3, 7, 14, then 30 days. “Again” brings a card back in 10 minutes. This simple schedule is stored only on this device.