Straive Technical Support Engineer Interview Questions and Answers

SQL joins are used to combine data from two or more tables based on a related column.

• Joins are used to retrieve data from multiple tables in a single query.

• There are different types of joins: inner join, left join, right join, and full outer join.

• Inner join returns only the matching rows from both tables.

• Left join returns all the rows from the left table and matching rows from the right table.

• Right join returns all the...read more

To get different values in a table, you can use SQL queries with DISTINCT keyword.

• Use SELECT statement with DISTINCT keyword to retrieve unique values from a specific column in a table.

• You can also use GROUP BY clause to group the data by a specific column and retrieve distinct values.

• If you want to get distinct values from multiple columns, you can use the combination of DISTINCT and CONCAT functions.

• Example: SELECT D...read more

To find duplicate values in a table, you can use SQL queries with GROUP BY and HAVING clauses.

• Write a SQL query to select the columns that may contain duplicate values.

• Use the GROUP BY clause to group the rows based on the selected columns.

• Add the HAVING clause with a COUNT function to filter out the groups with more than one occurrence.

• Execute the query to retrieve the duplicate values.