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Use of rownum and related functions in Oracle

by arg2 exceeds the group range. Check Several SQL statements: Statement 1: Select row_number () over (order by sale/cnt desc) As sort, sale/CNTFrom (Select-60 as sale, 3 as CNT from dual UnionSelect 24 as sale, 6 as CNT from dual UnionSelect 50 as sale, 5 as CNT from dual UnionSelect-20 as sale, 2 as CNT from dual UnionSelect 40 as sale, 8 as CNT from dual ); Execution result: Sort sale/CNT--------------------1 102 53 44-105-20 Statement 2: Query employees' salaries, sorted by department Sele

The beauty of algorithms-game theory + bitwise XOR

be defeated; otherwise, it will win; 2> (theorem 0) a group of natural numbers must have a number, which is greater than or equal to the result of all other numbers by bit XOR. Therefore, in a win-win situation, because all numbers have an exclusive bitwise OR result greater than zero, this (if all other numbers have an exclusive bitwise result) is obtained at a time) when the number falls to the result of all others, the situation becomes defeated. With the above theory, this question is very

Serial Port GPRS module programming in Linux

1. At + cmgf = 0 is set to PDU mode to send Chinese-encoded text messages 2. At + cmgs = Information Length The length of the information is the recipient's number segment plus the decimal length of the Information encoding segment (I .e., from 1100 0d91 to the last length divided by 2) 3. send SMS # Include # Include # Include # Include # Include # Include # Include # Include Struct pdu_info{Char cnswap [32]; // use the parity switch of the SMS c

Php bit operation usage

$ A $ B and (bitwise and)$ A | $ B or (by bit or)$ A ^ $ B Xor (bitwise Xor)~ $ A Not (Not by bit)$ A $ A >>$ B Shift right (right Shift)Details$ A $ B: Set the bitwise of 1 in both $ a and $ B to 1;Example: 10 12 = 810 101012 11001000 8$ A | $ B by bit or set one of $ a or $ B as 1;Example: 10 | 12 = 1410 101012 11001110 14$ A ^ $ B by bit orExample: 10 ^ 1210 101012 11000110 6~ A sets the value of 0 in $ a as 1, 1 as 0.Example :~ 10 =10 1010 1111111111111111111111111111111111111111111111111

The experiment tells you the misleading usage of or and between in the where condition (refuse to repost, which is mandatory for violators)

SQL> select * from EMP; Empno ename job Mgr hiredate Sal comm deptno------------------------------------------------------------------------------7369 Smith clerk 7902 17-dec-80 800 207499 Allen salesman 7698 20-feb-81 1600 300 307521 ward salesman 7698 22-feb-81 1250 500 307566 Jones manager 7839 02-apr-81 2975 207654 Martin salesman 7698 28-sep-81 1250 1400 307698 Blake manager 7839 01-may-81 2850 307782 Clark manager 7839 09-jun-81 2450 107788 Scott analyst 7566 19-apr-87 3000 207839 King Pre

China Railway stipulates that the mileage is priced in a tiered manner according to the mileage range

discount rate of the area in which the price range is delivered, and then calculate the discount mileage for each section,* This is the mileage that generates the fee and is used for calculating the next fare.**/Private Static int getfavourabletolldistance (INT km ){ // Determine the mileage rangeIf (km> 0 ){If (km gt; 200 ){If (km gt; 400 ){If (km gt; 700 ){If (km gt; 1100 ){If (km gt; 1600 ){If (km gt; 2200 ){If (km gt; 2900 ){If (km gt; 37

IAR data locating method, which is used to define the serial number and the data to be stored

msp430f149 xcl file is as follows: // Constant daTa -Z (const) daTa16_c, daTa16_id, difunct, checksum = 1100-ffdf If you want to split a part of it into a data storage area, make the following changes: -Z (const) daTa16_c, daTa16_id, difunct, checksum = 1500-ffdf // separate 1100-14ff from Rom to the number of Arry Group -Z (const) myseg = 1100-14ffThe interval

Python basic operations

value is less than or equal to the right A True Three, assignment operators Operator Describe Example = Assign value c = 30 += Add and assign values c+=10 equivalent toC=c+10 -= Subtract and assign values c-=10 equivalent toC=c-10 *= Multiply and assign values c*=10 equivalent toC=c*10 /= Divide and assign values c/=10 equivalent toC=c

BZOJ1016: [JSOI2008] minimum spanning tree count

the sort changes to qsort on a??? Metaphysics Operation: in fact, it seems that the problem is violence. But Miss Bo seems to be doing it half the morning. First of all must be the smallest spanning tree to find out, and then get a structure, indicating that l~r these edge values are equal, V indicates how much of this value of the edge, and then the possibility of a burst search.#include #include#includeusing namespacestd;Const intMod=31011;structnode{intX,y,d;} a[

Learn more about CSS Font metrics, line heights, and Vertical-align

,descender,capital height,x-height, etc.). Note that some values are values other than Em-square In the browser, the relative units are used for scaling to fit the desiredfont-size Let's look Catamaran at the font and look at the metric of the font in FontForge: Em-square is1000 Ascent (Ascender) is 1100 and descent (Descender) is 540 . Under the same test, the browser uses the Hhead ascent/descent value (MAC) and the win Ascent/

Process-memory segment mechanism

assumes that a directive references the logical address 4200 of a process, and when the reference instruction is executed, the hardware automatically resolves the logical address value 4200 (01 0000 0110 1000) to get segment_number = 1,offset = 00000 1101000 = 104, First, the hardware compares offset with size to check if offset is out of bounds, 104 If a directive references a process's logical address 7KB (01 1100 0000 0000), Get segmen

A picture of Python (with basic grammar summary)

= c-a= multiplication assignment operator C = A is equivalent to C = c * A/= Division assignment operator C/= A is equivalent to C = c/a%= modulo assignment operator C%= A is equivalent to C = c% A= Power assignment operator C = A is equivalent to C = c * * A= Take divisible assignment operator C//= A is equivalent to C = c//A③:python Bitwise operatorsThe variable a in the following table is 60,b 13 and the binary format is as follows:A = 0011 1100b = 0000 1101ab = 0000 1100a|b = 0011 1101A^b =

Simple MD5 Encryption Class (Md5utils) in Java

convert all the data into positive numbers: to //Explanation: Why use b255 + /* - * B: It would have been a byte type of data (1 bytes) 255: is an int type of data (4 bytes) the * Byte type data is operated with data of type int, automatic type promotion to int type eg:b: 1001 1100 (raw data) * * operation: b:0000 0000 0000 0000 0000 0000 1001 1100 255:0000 $ * 0000 0000 000

ALTER table adds a column and adds a check constraint

. sql> INSERT INTO EMP values (7876, ' Adams ', ' Clerk ', 7788,to_date (' 12-jan-1983 ', ' dd-mon-yyyy '), 1100, NULL, 20); 1 row created. sql> INSERT INTO EMP values (7900, ' James ', ' Clerk ', 7698,to_date (' 3-dec-1981 ', ' dd-mon-yyyy '), 950, NULL, 30); 1 row created. sql> INSERT INTO EMP values (7902, ' Ford ', ' Analyst ', 7566,to_date (' 3-dec-1981 ', ' dd-mon-yyyy '), 3000, NULL, 20); 1 row created. sql> INSERT INTO EMP values

Reproduced Loss of precision for JavaScript decimal and large integers

that the maximum number of integers that JavaScript can represent is: 1 x (2^53 - 1) x 2^971 = 1.7976931348623157e+308 The value is Number.MAX_VALUE.In the same vein, the value of Number.min_value can be deduced as: 1 x 1 x 2^(-1074) = 5e-324 Note that min_value represents a positive number that is closest to 0, not the minimum. The smallest number is-number.max_value.Decimal precision is missing Decimal 0.1 binary is 0.0 0011 0011 0011 ... (Loop 0011) decim

Java JDBC database Transaction acid__ Database

Import 100 Yuan to modify the balance of 1100 yuan T6 Commit a transaction T7 Remove 100 yuan to change the balance to 900 yuan T8 Undo Transaction T9 Balance restored to 1000 yuan (lost update) Class 2nd Loss Update: Transaction a overwrites the data already committed by transaction B, resulting in loss of operations by transaction B.

Problem analysis and solution method of Javascript floating-point operation _javascript Skill

Decimal binary0.1 0.0001 1001 1001 1001 ...0.2 0.0011 0011 0011 0011 ...0.3 0.0100 1100 1100 1100 ...0.4 0.0110 0110 0110 0110 ...0.5 0.10.6 0.1001 1001 1001 1001 ...So for example 1.1, the program can actually not really represent ' 1.1 ', but only to a certain extent accurate, which is unavoidable precision loss: 1.09999999999999999The problem in JavaScript is

Analysis and solution of Javascript floating-point arithmetic precision problem _javascript skill

Analysis JavaScript has only one numeric type number, and all numbers in JavaScript are represented in the IEEE-754 standard format. The precision problem with floating-point numbers is not JavaScript-specific, because some decimal digits are infinite in binary notation: Decimal binary0.1 0.0001 1001 1001 1001 ...0.2 0.0011 0011 0011 0011 ...0.3 0.0100 1100 1100 1100

Binary Inverse Code summation _TCP/IP

When you look at TCP/IP, you see that there is a header check in the IP protocol and a binary inverse code sum. Not quite understand, the Internet found an answer, recorded below. Check and verify with 4bit (easy to compute and 16bit is the same).Suppose the original data is 1100, 1010, 0000 (check digit)Then they are added by a bitwise-by-group in 4bit. 1100 Take the counter 0011, 1010 take the reverse

LEVELDB Source Analysis One: coding

subsequent byte is also part of the number, and if the bit is 0, the end. The other 7 bits (bit) represent numbers. The maximum number that a 7-bit can represent is 127, so numbers less than 128 can be represented in a single byte. A number greater than or equal to 128, say 300, is represented in memory with two bytes: Low height 1010 1100 0000 0010 The implementation process is as follows: The binary of 300 is 100101100, the lower 7 bits is 010

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