Insert dot into string MS Access

I have an Access table with about 90K records.   The field I need to change has a varying number of characters, between 3 and 7.   I need help for an Access update query that would insert a dot between 3rd and 4th characters.   Preferably no dot if the field has just 3 characters.
rrutland88Asked:
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Rey Obrero (Capricorn1)Commented:
create a backup of your table first
run this update query

update tableName
set [fieldName]= left([fieldName],3) & "." & mid([fieldname],4)
where len([fieldName]>3
Rey Obrero (Capricorn1)Commented:
oops, missing ")" before >


update tableName
set [fieldName]= left([fieldName],3) & "." & mid([fieldname],4)
where len([fieldName]) >3

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rrutland88Author Commented:
Thank you worked perfectly!   You are brilliant and I appreciate the fast expert response very much!
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Microsoft Access

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