The hierarchy of SQL expression

• scalar expr, a single value know as a field, or a list of single value know as a row
  • primary expr, in a primitive form.
    • value expr, a constant specifies a value.
      • literal
    • function call
  • binary expr, a combination of the other 2 expressions.
• query expr(table expr), a set of rows

Headings (# ## ### etc.)

Alt Heading 1 (Headings need 4 = or -)

Alt Heading 2 (Headings need 4 = or -)

Normal text bold then italic. Escape * ` < _ # \ & more.

1. Order list

• Unorder list ( - or + )

code: a === a

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Enjoy! :)