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Asked: 2026-05-25T06:05:22+00:00

I’m using this query but it is really really slow INSERT INTO a (b,c,d,e,f,g,h,i)

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I’m using this query but it is really really slow

   INSERT INTO a (b,c,d,e,f,g,h,i) SELECT b,c,d,e,f,g,h,i FROM z WHERE b NOT IN (SELECT b FROM a)

What is does is find all records where b is not in table “a” from table z and importing it into table a.

Its really really slow and keeps timing. Is there away to make it quicker?

Thank-you
BigThings

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1 Answer

  1. Editorial Team

    Make the b column unique, then INSERT with the IGNORE option, so:

       INSERT IGNORE INTO a (b,c,d,e,f,g,h,i)
     SELECT b,c,d,e,f,g,h,i FROM z
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