SQL 2
How do you count the variety of customers from each united states of america? - ANS-SELECT
COUNT(CustomerID), Country FROM Customers GROUP BY Country.
How do you create an alias for a column in SQL? - ANS-Using the AS key-word, e.G., SELECT
column_name AS alias_name.
How do you carry out a self be a part of? - ANS-By becoming a member of the table to itself
using aliases to differentiate the times.
What does a LEFT JOIN do? - ANS-It returns all rows from the left table and coupled rows from
the proper desk; unmatched rows will have NULLs.
What does the FULL JOIN do? - ANS-It returns all rows from each tables, with NULLs for
non-matching rows.
What does the GROUP BY clause do? - ANS-It businesses rows that have the same values in
designated columns into summary rows.
What does the ORDER BY clause do? - ANS-It kinds the end result set based on one or extra
columns.
What does the UPDATE assertion do? - ANS-It modifies current data in a table.
What does the WHERE clause do in a SELECT declaration? - ANS-It filters rows that don't
healthy the specified situation.
What occurs in case you miss the WHERE clause in an UPDATE announcement? - ANS-All
records in the table can be updated.
What is a herbal be a part of? - ANS-A sort of be a part of that robotically fits columns with the
identical names in each tables.
What is a subquery? - ANS-A whole SELECT declaration embedded inside any other SQL
assertion.
What is an aggregate function? - ANS-A function that plays a calculation on a hard and fast of
values and returns a unmarried price, e.G., COUNT, SUM, AVG.
How do you count the variety of customers from each united states of america? - ANS-SELECT
COUNT(CustomerID), Country FROM Customers GROUP BY Country.
How do you create an alias for a column in SQL? - ANS-Using the AS key-word, e.G., SELECT
column_name AS alias_name.
How do you carry out a self be a part of? - ANS-By becoming a member of the table to itself
using aliases to differentiate the times.
What does a LEFT JOIN do? - ANS-It returns all rows from the left table and coupled rows from
the proper desk; unmatched rows will have NULLs.
What does the FULL JOIN do? - ANS-It returns all rows from each tables, with NULLs for
non-matching rows.
What does the GROUP BY clause do? - ANS-It businesses rows that have the same values in
designated columns into summary rows.
What does the ORDER BY clause do? - ANS-It kinds the end result set based on one or extra
columns.
What does the UPDATE assertion do? - ANS-It modifies current data in a table.
What does the WHERE clause do in a SELECT declaration? - ANS-It filters rows that don't
healthy the specified situation.
What occurs in case you miss the WHERE clause in an UPDATE announcement? - ANS-All
records in the table can be updated.
What is a herbal be a part of? - ANS-A sort of be a part of that robotically fits columns with the
identical names in each tables.
What is a subquery? - ANS-A whole SELECT declaration embedded inside any other SQL
assertion.
What is an aggregate function? - ANS-A function that plays a calculation on a hard and fast of
values and returns a unmarried price, e.G., COUNT, SUM, AVG.
