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　　 Speaking of Tencent, we all know that this is a domestic largest internet company, the market value of more than 300 billion, with more than 700 million users, remember some of the magazine once said "look at Tencent, so many users, throw a stick in the inside can open flowers." The saying is that there is a great chance of success on the user base of Tencent. But this is not the case, Tencent has instant messaging, games, online shoppin

and 1, the closer the value is to 1, the higher the precision or recall. 3. F = correct rate * Recall rate * 2/(correct rate + recall rate) (f value is the correct rate and recall rate of the harmonic mean) Take this example: there are 1400 carp, 300 shrimp and 300 turtles in a pond. It is now for the purpose of catching carp. 700 Carp, 200 shrimp and 100 turtles were caught in a large net. Then, the indicators are as follows: Correct rate =

statistical code as a picture through the browser access trigger, the code is implemented as follows. second, the introduction of the page In the Web page to do statistics to introduce statistical scripts, and actively other interfaces to obtain the MAC and IP address in addition, a simple page design as shown in the code below. third, data reception Receive escalated data in the background interface. We use the PHP program to get get and post data to receive. The data in the file log obtai

Support Chinese, otherwise it may be garbled after use3, Putty key authenticationGenerate key: Run puttygen.exe------Click Generate (Note: You need to move the mouse back and forth in the process of generating the key, otherwise the generated key will be very slow)-----generated key Click Key Passphrase set extract private key password-----Click Save Public Key and private key (save in a folder)------Public key, private key generation completeIn the Putty client follow the steps:1> mkdir/root/.

'; TABLE_NAME Num_rows BLOCKS Empty_blocks ---------- -------- ------- ------------- BIG_EMP1 28672 700 323 1 row selected. Attention: BLOCKS + empty_blocks (700+323=1023) than dba_segments. Blocks less than 1 database blocks, because a database block is reserved for use as the segment header. Dba_segments. BLOCKS represents the number of all database blocks allocated to this table. User_tables. Blocks ind

I attended a data analysis interview with a company in Hangzhou this afternoon. I am familiar with some of the questions, but I didn't give the best answer. Share: Data Structure: Name category cost Li weixing movie 30 Li weixing 100 Li weixing 500 Wang weixing 500 Wang weixing 100 Wang weixing clothes 700 display effect: prenamecodeclasssql name I attended a data analysis interview with a company in Hangzhou this afternoon. I am familiar with some of

allocated to the table but above the waterline, that is, the data block that has never been used. Let's take a BIG_EMP1 table with 28672 rows as an example: 1) SQL> SELECT segment_name, segment_type, blocks FROM dba_segments WHERE segment_name = 'Big _ emp1 '; SEGMENT_NAME SEGMENT_TYPE BLOCKS EXTENTS --------------------------------------------------------------- BIG_EMP1 TABLE 1024 2 1 row selected. 2) SQL> ANALYZE TABLE big_emp1 ESTIMATE STATISTICS; State

This article mainly introduces JQuery's method for displaying the description layer by moving the mouse over an image, and describes how to use jQuery mouse events and animation effects, for more information about JQuery, see the following example. Share it with you for your reference. The details are as follows: This can be used with JQuery easing animations. The main code is as follows: $ (". Item "). hover (function () {// $ (this ). children ("img "). stop (). animate ({opacity: 0.8},

FROM user_tables WHERE table_name = 'Big _ emp1 '; TABLE_NAME NUM_ROWS BLOCKS EMPTY_BLOCKS -------------------------------------- BIG_EMP1 28672 700 323 1 row selected. Note: BLOCKS + EMPTY_BLOCKS (700 + 323 = 1023) has one database block less than DBA_SEGMENTS.BLOCKS because one database block is reserved as the segment header. DBA_SEGMENTS.BLOCKS indicates the number of all database blocks allocated to t

a certain threshold.We can view this threshold by using the Get_threshold () method of the GC module:Import Gcprint (Gc.get_threshold ())Return (700, 10, 10), followed by two 10 is the threshold associated with generational collection, which can be seen later. 700 is the threshold at which garbage collection starts. Can be reset by the Set_threshold () method in the GC.We can also start the garbage collect

method is to combine various methods (including methods other than the aforementioned methods) to solve some problems. Where can I go for an interview example at USD? Three friends stayed in a hotel. At checkout, the total bill is USD. Each of the three friends shared $ and handed over the $ to the waiter, entrusting him to pay the account on behalf of the master station. However, at the time of settlement, the hotel offered a preferential price. The total station refunded $500 to the waiter an

(this. width> = 700) window. Open ('HTTP: // www.darkcb.com/attachment/mon_1006/49_26_29230fe1de3a94b.jpg ');}} "Src =" http://www.darkcb.com/attachment/Mon_1006/49_26_29230fe1de3a94b.jpg "border =" 0 "alt =" ">Figure 1 single-choice File{Function onclick (){If (this. width> = 700) window. Open ('HTTP: // www.darkcb.com/attachment/mon_1006/49_26_0627caffdce1232.jpg ');}} "Src =" http://www.darkcb.com/attac