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hello everyone and welcome to another sql query training session with learn at no star in todays session we are going to discuss a tricky sql query that is asked in many sql interviews so what they want us to do is that they want us to replace multiple commas in a string by a single comma so the scenario is something like this you have an input column that has data which is it it has a string value and within that string value you have commas at different places and different number of commas so for example between abc and ef you have two commas between def and ghi you have five commas and so on so all these commas they want us to replace just by a single column so wherever there are multiple commas we need to replace it by a single comma so this is a scenario that we need to address so lets start with writing the query so lets write a statement starting with the select and then were going to use the replace function and were going to replace the value in the string which is defin