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Apr 21st, 2018
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  1. SELECT * FROM t1
  2. LEFT JOIN (t2, t3, t4) ON (t2.a=t1.a AND t3.b=t1.b AND t4.c=t1.c)
  3.  
  4. SELECT * FROM t1
  5. LEFT JOIN t2 ON t2.a=t1.a
  6. LEFT JOIN t3 ON t3.b=t1.b
  7. LEFT JOIN t4 ON t4.c=t1.c
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