create index emp_job_sal_index on emp(job,sal); mysql> explain select * from emp where job = 'MANAGER'; +---+---+---+---+---+---+---+---+---+---+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +---+---+---...
select ename from scott.emp where ename like 'M_' (_表示一个任意的字符) is null 是否为空 select ename from scott.emp where ename is null is not null 不为空 select ename from scott.emp where ename is not null 逻辑操作符: or(或) select ename from scott.emp where ename='joke' or e...
- Anna, can you tcll me some ways to learn English well?Sure., you can watch English films. A. At last B. In all C. For example D. In fact( A ) 8. Dad gives Mum a ring as a gift on her birthday and the ring gold(黄金). A. is made of B. is made from C. is made...
aI see.It shows that the population in developing countries is larger than that in developed countries,doesn;t it? 我看见。它表示,人口在发展中国家大于那在发达国家, doesn; t它?[translate] a换股计划,使TCL背负不必要的包袱 Trades the stock plan, causes TCL to have the nonessential baggage[tran...
2.M:You've just come back from Hainan Island.What's it like there? W:It's a fantastic place.It is the second largest island in our country.It has some beautiful beaches. 3.W:What were you doing at about 8:00 last night? M:I was watching TV. W:How about your parents? M:Well...
aWhat you can do is print a configruation page and see how much of your total memory is being allocated to the RAM disk on the printer. Now go to the printer control panel and go to the configuration menu and change the RAM disk from auto to on and then specify and larger size tha...
[Scene: Joey and Rachel's, Rachel is watching Cujo while Joey returns from his date scaring Rachel.] Rachel: Oh God! Thank God you’re home! I’m watching Cujo. Joey: (incredulous) Alone?! Rachel: Yes! But what is wrong with this dog?! Joey: Hey, did you get to the part where...
Hello all, It seems TCLMagick is no longer part of my Linux distribution Debian Wheezy. I solved this problem by shelling out to ImageMagick. It works and...
For now suffices to say, that is a valid a simple quantum process. - If we simply measure them, the states and are indistinguishable from each other. Both yield and with equal probabilities . That’s why I say that is similar to our classical bit-flipping operation . - However, when ...
See Highland cows wandering freely on unfenced roads around Elgol in the south of the Isle of Skye. Or stay at Romesdal Highlanders B&B in the north, where you can enjoy seeing the Highland cows and beautiful views from the window. There is a road bridge crossing, and you can also catch...