In a single table (with 10 columns) join query the number of values needed to examine per column is __________(a) 1(b) 10(c) 0(d) 2I had been asked this question by my college professor while I was bunking the class.This is a very interesting question from Using Indexing in division Query Optimization of MySQL

In a single table (with 10 columns) join query the number of values ne

1.	In a single table (with 10 columns) join query the number of values needed to examine per column is __________(a) 1(b) 10(c) 0(d) 2I had been asked this question by my college professor while I was bunking the class.This is a very interesting question from Using Indexing in division Query Optimization of MySQL
Answer» RIGHT ANSWER is (b) 10 For EXPLANATION I would say: For indexing in the context of performing joins, in a single table query, the number of values that are needed to be examined per COLUMN is the number of rows in the table.

Discussion

No Comment Found

Related InterviewSolutions

“MODIFY” is used with which “Query clause”?(a) ALTER(b) FROM(c) WHERE(d) ORDER BYI had been asked this question at a job interview.My query is from Query Clauses topic in section Query Optimization of MySQL
Which among the following is not a “query clause”?(a) WHERE(b) MODIFY(c) ALTER(d) FROMThe question was asked by my college director while I was bunking the class.My question is taken from Query Clauses in section Query Optimization of MySQL
Which clause is used to “Modify the existing field of the table”?(a) ALTER(b) FROM(c) SELECT(d) MODIFYThe question was asked at a job interview.This interesting question is from Query Clauses in division Query Optimization of MySQL
Which clause is used to “sort the rows of the final result set by one or more columns”?(a) HAVING(b) ORDER BY(c) WHERE(d) FROMThis question was addressed to me in class test.This is a very interesting question from Query Clauses topic in chapter Query Optimization of MySQL
Which clause is used to “filter out unwanted Groups”?(a) HAVING(b) FROM(c) WHERE(d) SELECTI have been asked this question in an internship interview.This is a very interesting question from Query Clauses topic in section Query Optimization of MySQL
Which clause is used to “group rows together by common columns values”?(a) SELECT(b) GROUP BY(c) FROM(d) WHEREThis question was posed to me during an internship interview.The doubt is from Query Clauses in section Query Optimization of MySQL
Which clause is used to “Filters out unwanted data”?(a) FROM(b) WHERE(c) SELECT(d) ORDER BYThis question was posed to me by my school teacher while I was bunking the class.The query is from Query Clauses in section Query Optimization of MySQL
Which clause is used to “Identifies table from which to draw table and how the table should be joined”?(a) FROM(b) SELECT(c) ORDER By(d) WHEREThis question was posed to me in an interview for job.My question comes from Query Clauses in section Query Optimization of MySQL
Which clause is used to determine “which column to include in the query sets”?(a) SELECT(b) FROM(c) WHERE(d) ORDER BYThis question was posed to me in exam.My question is from Query Clauses topic in division Query Optimization of MySQL
Select the sequence for how the query mechanism works?(a) Authentication-> DDL->DML->query optimizer->output(b) DDL->DML->query optimizer-> Authentication->output(c) DML->query optimizer-> Authentication-> DDL-> output(d) All of the mentionedThis question was posed to me in my homework.This interesting question is from Query Mechanics topic in section Query Optimization of MySQL

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment