What does the SQL statement select * from employees do?
SELECT * FROM employees; This retrieves all columns from the employees table. Lees verder »
What does the SQL statement SELECT count(*) from employees do?
COUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately. This includes rows that contain null values. Lees verder »
What does the SQL query SELECT * from a table do?
If you use a “*” in the SELECT statement, you will retrieve data from all columns from the object(s) in the FROM clause. For example, this query returns all the columns from the tv_show table in the SANDBOX schema. SELECT * FROM SANDBOX. Lees verder »
What does the SQL statement SELECT * from customers do?
The SELECT statement can retrieve data from multiple tables using joins. For example, if you had an Orders table linked to Customers via CustomerID, you could write: SELECT Customers. CustomerName, Orders. Lees verder »
What does WHERE department sales indicate in the following SQL query SELECT * from employees WHERE department sales?
It indicates that the query should return only those rows from the database table where the value in the department column matches 'Sales'. This means that any employee who does not belong to the Sales department will be excluded from the output. Lees verder »
