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Copy codeThe Code is as follows:-- Simple Case FunctionCASE sexWHEN '1' THEN 'male'WHEN '2' THEN 'female'ELSE 'others' END-- Case search functionCase when sex = '1' THEN 'male'WHEN sex = '2' THEN 'female'ELSE 'others' END These two methods can achieve the same function. Simple Case functions are relatively simple in writing, but compared with Case search functions, there are some functional limitations, suc

. 2. Disable memcache or restart the memcache service. The first attempt failed. The second one can restart the memcache service, but the backend can be cleared. Global-> Performance Optimization-> memory optimization can be cleared. In addition, if there is no data in the latest post, it may be that the reading permission has been set for each Forum section. If there is a set reading permission, no data will be displayed, blood and tears, debugging takes a long time to discover Origina

Teaching objectives: 1. Have a clear understanding of the concept of inertia force. 2. Master the method for simplifying the inertia force of the point system, and correctly calculate the principal vector and moment of the inertia force of the ing, fixed axis rotation, and Plane Motion rigid body. 3. Be proficient in solving dynamic problems by using the DA rang principle. 4. The moment of inertia, inertia product (centrifugal Moment of Inertia) of t

Linux Study Notes 1-ubuntu installation and basic settings, Study Notes 1-ubuntu In the past few days, we have already met Huawei, and we have two e-mails with Alibaba. It looks like everything went smoothly. However, it seems that the interviewers of various major companies will ask more or less questions about programming skills in the linux environment, and I am quite involved in this field, I chose the

#include #defineint long Longusing namespacestd;Const intmaxn=4e6+ -;intPHI[MAXN];intPRIME[MAXN];intVISIT[MAXN];inttot=0;intNUM[MAXN];intANS[MAXN];voidBuild_phi (intN) {phi[1]=1; for(intI=2; i) { if(!Visit[i]) {prime[++tot]=i; Phi[i]=i-1; } for(intj=1; J) {Visit[i*prime[j]]=

MATLAB learning notes (2): symbol computation _-_ 1, matlab _-_ 1 2.1 symbol object and Symbol Expression Create a basic symbol object syms aCreate a basic symbolic number sym('num')sc=sym('num') The difference between a symbolic number and a numeric number >> clear>> a=5+pi,b=sym('5+pi'),ca=class(a),cb=class(b),vpa(a-b)a = 8.1416 b = pi + 5 ca =doublecb =sym ans = -0.0000000000000001224646799147353

Error tipsInvalid byte 1 of 1-byte UTF-8 sequenceCause analysisIn the Chinese version of Windows, the default encoding of Java is GBK, which means that although we identify the XML to be saved as Utf-8 format but actually the file is saved in GBK format, so that's why we can use GBK, GB2312 encoding to generate XML files can be parsed correctly, and files generated in UTF-8 format cannot be parsed by the XM

property stores the key in the key-value pair. The v attribute saves the value in the key-value pair. The value in the key-value pair can be a pointer, A uint64_t integer, or an int64_t integer. The next attribute is a pointer to another hash table node and uses the link address method to solve the key conflict problem. /** Dictionary */typedef struct dict {// type-specific function dictType * type; // Private Data void * privdata; // hash table d

9 principles of GUI Design (Article 1) and 9 principles of gui Design (Article 1) Basic Principle 1: Focus on users and their tasks, rather than technologyBasic Principle 2: first consider the function and then representBasic Principle 3: Consistent with users' views on tasksBasic Principle 4: The design must comply with common conditionsBasic Principle 5: do no

After Json_encode, the JSON data becomes [{"A", "1"}], how to change to {"A", "1"} function Get_js_array ($sql) {$result = mysql_query ($sql);$arr = Array ();while ($row = Mysql_fetch_array ($result, Mysql_assoc)) {$arr [] = $row; }$js = Json_encode ($arr);Mysql_free_result ($result);Mysql_close ($conn);return $JS;} Please rewrite it according to this. Thank you ------to

SQL tips: WHERE 1 = 1, SQL tips Due to project requirements, you need to manually splice SQL statements (do not know what leaders think ......), And then return to the original age, append (SQL ). However, the subsequent query involves multiple dynamic conditions. if mybatis Is, You can directly splice dynamic SQL statements with the Later, a friend told me a way to easily

method.However, there is a problem with subsequent insertions that are not the largest values in the current list, such as by 4, 3, 2, 1, or other order. As this example, the final list element values are 1, 2, 3, 4, respectively. That is, the last element would have to be 4jiffies due, and now it needs to be 10jiffies. Obviously unreasonable.How to solve this p