eClinicalWorks Interview Questions, Process, and Tips

Joins are used to combine data from two or more tables based on a related column between them.

• Types of joins include 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 rows from the right table and matching rows from the left table.

• Full outer...read more

Truncate is a DDL operation that removes all rows from a table, while delete is a DML operation that removes specific rows.

• Truncate is faster than delete as it doesn't generate any undo logs or triggers.

• Truncate cannot be rolled back, while delete can be rolled back using the transaction log.

• Truncate resets the identity of the table, while delete doesn't.

• Truncate doesn't fire delete triggers, while delete does.

• Truncate...read more