How can you determine whether a string is present in a field?

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To determine whether a string is present in a field, you can use a string search function such as the "INSTR" function in SQL or the ".find()" method in Python. These functions return the position of the first occurrence of the search string within the field, or -1 if the string is not found. You can then use conditional statements to take action based on whether the search string is found or not.