in MAMP database: if i check NULL, then it can be NULL
for large file to import
check the host name in the db previliege
change foler permission
set the type for a column as ENUM and set values as 'a','b','c',...
$filename = '*.csv', doesn't need to include ip or folder here = =
remove non-numeric characters except for dots
excel find blanks
excel duplicates
excel autofill shortcut
excel too many data
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