Write a script that adds rows to the database that you created in exercise 2. add two rows to the users and products tables. add three rows to the downloads table: one row for user 1 and product 2; one row for user 2 and product 1; and one row for user 2 and product 2. use the sysdate function to insert the current date into the download_date column. use the sequences created in the previous exercise to get the values for the user_id, download_id, and product_id columns. write a select statement that joins the three tables and retrieves the data from these tables like this: sort the results by the email address in descending sequence and the product name in ascending sequence. 4. write an alter table statement that adds two new columns to the products table created in exercise 2. add one column for product price that provides for three digits to the left of the decimal point and two to the right. this column should have a default value of 9.99. add one column for the date and time that the product was added to the database. 5. write an alter table statement that modifies the users table created in exercise 2 so the first_name column can store null values and can store a maximum of 20 characters. code an update statement that inserts a null value into this column. it should work since this column now allows null values. code another update statement that attempts to insert a first name that’s longer than 20 characters. it should fail due to the length of the column.

Work with a monitor that’s calibrated and profiled. for critical image editing, calibration and profiling are essential. otherwise, the image you see on your monitor looks different on other monitors or when printed.plan to use adjustment layers to adjust the tonal range and color balance of your image. adjustment layers let you go back and make successive tonal adjustments without discarding or permanently modifying data from the image layer. keep in mind that using adjustment layers adds to the file size of the image and demands more ram from your computer. accessing the color and tonal commands in the adjustments panel automatically creates adjustment layers.if you don’t want to use adjustment layers, you can apply adjustments directly to an image layer. remember that some image information is discarded, when making a color or tonal adjustment directly to an image layer.for critical work and maximum preservation of image data, it’s best if the image you work with is 16 bits per channel (16‑bit image) rather than 8 bits per channel (8‑bit image). data is discarded when you make tonal and color adjustments. the loss of image information is more critical in an 8‑bit image than a 16‑bit image. generally, 16‑bit images have a larger file size than 8‑bit images.duplicate or make a copy of the image file. working on a copy of your image preserves the original in the event you want to use the image in its original state.remove any flaws such as dust spots, blemishes, and scratches from the image before making color and tonal adjustments.open the info or histogram panel in expanded view. as you evaluate and correct the image, both panels display invaluable feedback on your adjustments.you can make a selection or use a mask to confine your color and tonal adjustments to part of an image. another way to apply color and tonal adjustments selectively is to set up your document with image components on different layers. color and tonal adjustments are applied to only one layer at a time. only the image components on the targeted layer are affected.

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Answercomputer processing power would double approximately every (2) years;