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I have to update many records. I don't want to duplicate the entries. The table concatenates the value to the end. So in theory, I could add the value twice.

I want to put a check to make sure the entry is not already there; if it is, then skip the record.

update table1 
set value=concat(value,',test_data') 
where field1='abc';
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    Fix the list of doom and these sort of questions will be obvious. – danblack Sep 18 '18 at 22:43
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UPDATE table1 
SET value=CONCAT(value, ',test_data') 
WHERE field1='abc'
  AND NOT INSTR(CONCAT(',',value,','), ',test_data,');

But I'd recommend to normalize your data structure... CSV data field is not safe.

  • Fails to handle start and end of string. Switch to FIND_IN_SET(). – Rick James Oct 7 '18 at 23:49
  • @RickJames ??? why? – Akina Oct 8 '18 at 5:09

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