Concatenate string in MySQL update query

I need to update all the fields in table based on other fields

field1 = field2 + "_" + field3 + "_" + field4

I have have the use of CONCAT but not sure how to use it.

Thanks
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SaltyDawgAsked:
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Kevin CrossChief Technology OfficerCommented:
You can use the CONCAT with separator like this:
update your_table
set field1 = concat_ws('_', field2, field3, field4);

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Kent OlsenDBACommented:
Hi SaltyDawg,

Exactly which concatenation operator you can use depends on the SQL parser settings.  :)

Regardless of the shortcut, you can always call the CONCAT function.  Just list the items to be concatenated.

  CONCAT (field2, "_", field3, " ", field4);


Good Luck,
kent
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SaltyDawgAuthor Commented:
Thanks
I actually used both concat_ws and CONCAT and orginally it did not work but I see my errors. I had quotes around my field names.
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SaltyDawgAuthor Commented:
I shared your points. Since mwvisa1 responded first and i did use the concat_ws method I award him more points. Thanks to you both.
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