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Why index is important in SQL?

3. Why index is important in SQL?

1. The large database can be searched quickly with SQL Indexes.
2. The concept below is a quick way to include different values in those columns.
3. A smaller table may not recognize the performance of an index when used with an index.
4. All of the above

Answer: D) All of the above

Explanation:

The index is important in SQL because –

1. The large database can be searched quickly with SQL Indexes.
2. The concept below is a quick way to include different values in those columns.
3. A smaller table may not recognize the performance of an index when used with an index.
4. Columns (fields) in this data structure are sorted either ascendingly or descendingly according to their data values. For each value, an entry is assigned.
5. There are only two columns in each index table. Row_id is the first column, and indexed-column is the second.