Consider the following matrix:    P = [3 6 9 12; 4 8 12 16; 3 6 9 12]   What Octave command will you use to change all the values in the third column to 2?

The Finance team wants to calculate a VAT (8%) on the amount of the stay reservations in the database. However, the team wants to calculate the VAT after the discounts are applied on the prices. In addition, it is important to remember if there is no discount/offers, then the value is NULL in the TRAVELS table. Create a procedure called VATCalculator to calculate the VAT amount and return with the corresponding travel ID. In addition, execute the procedure to account for NULL values and send the respective result to the team. The VAT value should be rounded to 2 decimals.

What is the most efficient way to write a trigger that updates a large number of rows?     Specify "for each statement"     Specify "for each row"     Specify "for each table"     Specify "referencing new row"

TODO 12 Let's now split our input data X and labels y into a train and test set using the train_test_split() function (docs). Here we'll use the 80-20 split rule where we use 80% of the data for training and 20% for testing. Lastly, we'll seed our split using the random_state keyword argument which will make sure we create the same split every time we run the function. Use the train_test_split() function to get a train and test split. Store the output into X_train, X_test, y_train, and y_test. Pass the required arguments X and y. Further specify we want to use 20% of the training data by setting the test_size keyword argument. Lastly, pass the keyword argument random_state=42 to set the random seed so we get the same split every time we run this code. Print the shape for X_train. Print the shape for y_train. Print the shape for X_test. Print the shape for y_test. # TODO 12.1X_train, X_test, y_train, y_test =  todo_check([    (X_train.shape == (413, 29), 'X_train does not have the…

The InstantRide Driver Relationship team wants to learn how many travels each driver has done in the month of October. You need to send them the DRIVER_ID, and two calculated columns: DAY and RIDES. The DAY column is calculated using the DAY() function with the TRAVEL_START_TIME as the argument. The RIDES column is calculated by using the COUNT() function to determine the number of rides given for each day. Filter the results with the MONTH function.

User Satisfaction team wants to send monthly summaries for each user. They need the following details with the user ID: The last day of the month when the users traveled most recently One week after the last day of the month when the users traveled most recently You need to return a three-column output with USER_ID, LAST_TRAVEL_MONTH and NOTIFICATION. LAST_TRAVEL_MONTH should be calculated using the MAX of the LAST_DAY of the TRAVEL_END_TIME field. Similarly, NOTIFICATION should be calculated with DATE_ADD function to add one week.