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In Listing 9-35, we go one step further, using the VERSIONS BETWEEN operator. Now we get the complete history of the rows that is, as far as the Oracle DBMS is able reconstruct them. Listing 9-35. Flashback example: VERSIONS BETWEEN syntax break on empno empno, msal versions_starttime versions_endtime e versions between timestamp minvalue and maxvalue where deptno = 10 order by empno, versions_starttime nulls first; EMPNO MSAL -------- -------7782 2450 2460 2440 2440 7839 5000 5010 4990 4990 7934 1300 1310 1290 1290 VERSIONS_STARTTIME VERSIONS_ENDTIME ------------------------- ------------------------01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:55:24.000 01-OCT-2004 10:55:24.000 01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:55:24.000 01-OCT-2004 10:55:24.000 01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:23.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:54:41.000 01-OCT-2004 10:55:24.000 01-OCT-2004 10:55:24.000 select , , from
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By using the VERSIONS BETWEEN operator in the FROM clause, you introduce several additional pseudo columns, such as VERSIONS_STARTTIME and VERSIONS_ENDTIME. You can use these pseudo columns in your queries. By using the correct ORDER BY clause (watch the NULLS FIRST clause in Listing 9-35), you get a complete historical overview. You don t see a start time for the three oldest salary values because you created the rows too long ago, and you don t see an end time for the last value because it is the current salary value.
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FLASHBACK TABLE
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In 7, you learned that you can rescue an inadvertently dropped table from the recycle bin with the FLASHBACK TABLE command. Listing 9-36 shows another example of this usage.
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Listing 9-36. Using FLASHBACK TABLE ... TO BEFORE DROP drop table e; Table dropped. flashback table e to before drop; Flashback complete. select * from e; EMPNO -----7499 7521 7654 7698 7844 7900 ENAME -------ALLEN WARD MARTIN BLAKE TURNER JONES INIT ----JAM TF P R JJ R JOB MGR BDATE MSAL COMM DEPTNO -------- ------ ----------- ------ ------ -----SALESREP 7698 20-FEB-1961 1610 300 30 SALESREP 7698 22-FEB-1962 1260 500 30 SALESREP 7698 28-SEP-1956 1260 1400 30 MANAGER 7839 01-NOV-1963 2860 30 SALESREP 7698 28-SEP-1968 1510 0 30 ADMIN 7698 03-DEC-1969 810 30
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You can go back to any point in time with the FLASHBACK TABLE command, as you can see in Listing 937. Note the following important difference: Listings 9-32 and 9-33 show queries against table E where you go back in time, but the FLASHBACK TABLE example in Listing 9-37 changes the database and restores table E to a given point in time. Listing 9-37. Another FLASHBACK TABLE Example select count(*) from e; COUNT(*) -------6 flashback table e to timestamp to_timestamp('×tamp'); Enter value for timestamp: 01-OCT-2004 10:54:00.000 Flashback complete. select count(*) from e; COUNT(*) -------14 It is not always possible to go back in time with one table using the FLASHBACK TABLE command. For example, you could have constraints referring to other tables prohibiting such a change. See Oracle SQL Reference for more details about the FLASHBACK TABLE command.
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9.8 Exercises
You can practice applying the advanced retrieval functions covered in this chapter in the following exercises. The answers are presented in Appendix B. 1. It is normal practice that (junior) trainers always attend a course taught by a senior colleague before teaching that course themselves. For which trainer/course combinations did this happen Actually, if the junior trainer teaches a course for the first time, that senior colleague (see the previous exercise) sits in the back of the classroom in a supporting role. Try to find these course/junior/senior combinations. Which employees never taught a course Which employees attended all build courses (category BLD) They are entitled to get a discount on the next course they attend. Provide a list of all employees having the same monthly salary and commission as (at least) one employee of department 30. You are interested in only employees from other departments. Look again at Listings 9-3 and 9-4. Are they really logically equivalent Just for testing purposes, search on a nonexisting job and execute both queries again. Explain the results. You saw a series of examples in this chapter about all employees that ever taught an SQL course (in Listings 9-9 through 9-11). How can you adapt these queries in such a way that they answer the negation of the same question ( all employees that never ) Check out your solution for exercise 4 in 8: For all course offerings, list the course code, begin date, and number of registrations. Sort your results on the number of registrations, from high to low. Can you come up with a more elegant solution now, without using an outer join Who attended (at least) the same courses as employee 7788
3. 4. 5.
10. Give the name and initials of all employees at the bottom of the management hierarchy, with a third column showing the number of management levels above them.
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