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using % and? as placeholders sqlite3.
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Here is a Python code for using % and? as placeholders sqlite3d

import re

def sql_placeholders(string):
    """
    Replace % and? with the corresponding values in the string.
    """
    return re.sub(r'\%([^\%]*)\%', lambda m: m.group(1), string)

# Enter the string
string = "select * from t1 where? =?"

# Calling the function
print((sql_placeholders(string)))

#Example Output
# select * from t1 where? =?

#Remember to inspect code for bugs.