join and count: group by issue when trying to perform a left join only

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情歌与酒
情歌与酒 2020-11-28 01:12

I have two tables:

TABLE A (fields)
ID_A | NAME_A
_____________
  1A
  2A
  3A

TABLE B (forms)
ID_B | NAME_B
____________
  1B
  2B
  3B
  4B
<
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