A user of my extension weewx-GTS reported an error in a call of genSql() 
from manager.py. The original line is:

for _result in db_manager.genSql(
        "SELECT `dateTime`,`usUnits`,"
        "`outTemp`,`outHumidity`,`pressure`"
        "from %s WHERE dateTime>? AND dateTime<=?"
        "ORDER BY `dateTime`"
        % db_manager.table_name,timespan):
    ...

He claimed that he had to change that line for use with MySQL to:

for _result in db_manager.genSql( "SELECT 
`dateTime`,`usUnits`,`outTemp`,`outHumidity`,`pressure` from %s WHERE 
dateTime> %d AND dateTime<= %d ORDER BY `dateTime`" % 
(db_manager.table_name,timespan.start,timespan.stop)):

Those 2 question marks are always used throughout WeeWX. So I do not 
understand why it causes an error in this case. 

Some hints?

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