How to check if a record exists in a mysql database php?

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State the differences between mongodb and mysql.

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Is primary key auto increment?

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Differentiate between FLOAT and DOUBLE?

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What happens when the column is set to AUTO INCREMENT and you reach the maximum value for that table?

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if we want to load data from a text file into a mysql table, but the columns in table are 1st: code(int) and 2nd: city(varchar), but in text file the format is 1st cityname and then code separeted by delimeters. how to load?

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What is the purpose of using timestamp data type?

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Write a command to view mysql database table structure?

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Is mysql case-sensitive?

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What is flush privileges in mysql?

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What is the difference between is null & is not null?

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How do I change global variables in mysql?

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