SQL Ch5 Review
Help!
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| You can use the ___ command to change rows on which a specific condition is true. | UPDATE
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| During your current work session, you can ___ (save) your changes immediately by executing the ___ command. | commit, COMMIT
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| If you decide that you don't want to save the change you have made during your current work session, you can ____ (reverse) the change by executing the ___ command. | roll back, ROLLBACK
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| The ROLLBACK command reverses only changes made to the data; it does not reverse the changes made to a _____ ____. | table's structure
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| A ___ is a logical unit of work. | transaction
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| A ____ can be viewed as a sequence of steps that accomplishes a single task. | transaction
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| You can use the ___ command to remove rows from a table. | DELETE
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| You can change a table's structure by using the __ ___ command. | ALTER TABLE
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| To add a new column, use the ___ clause of the ALTER TABLE command. | ADD
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| 8.You can change the characteristics of existing columns by using the ___ clause of the ALTER TABLE command. | MODIFY
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| You can use the ____ clause of the ALTER TABLE command to change a column that currently rejects nulls values so that it will accept null values. | MODIFY
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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