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"This is one of the most important questions that interviewer might be asking in an interview.Infyosis,Linked group,Kyndryl,Vodafone Idea,IBM and Mphasis etc" INTRODUCTION: It is said to be set operators which is used to combine, add or concatenate two or more result sets. It is used in the multiple select statements where to combine to produce the final desired results.In other words,multiple select statements of similar column name in same order and having same data type to produce the unified result.In MIS datalake,when you are adding the modules of GST reconciliation which is to be used in micros in Excel or VB script, union and union all set operator is preferred for eliminating duplicate records or keeping duplicate records as per business requirement. Column must be of the same datatype for these operations of one select statement with another select statements. Columns must be in the same order in this set operators in the multiple select statements. Same number of co...
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