[MySQL]行列转换变化各种方法实现总结（行变列报表统计、列变行数据记录统计等）_MySQL
前言：
mysql行列变化，最难的就是将多个列变成多行，使用的比较多的是统计学中行变列，列变行，没有找到现成的函数或者语句，所以自己写了存储过程，使用动态sql来实现，应用业务场景，用户每个月都有使用记录数录入一张表，一个月一个字段，所以表的字段是动态增长的，现在需要实时统计当前用户使用的总数量，如果你知道有多少个字段，那么可以用select c1+c2+c3+…. From tbname where tid=’111’;来实现，但是关键是这个都是动态的，所以在应用程序端来实现确实不适宜，可以放在数据库后台在存储过程里实现。
而且在行变成列中，如果要写单个sql来实现，列的数目就需要写死，因为如果不知道要展示成多少列的话，就需要用动态变量，而一条sql里面无法使用动态变量。但是可以使用sql块来实现动态的效果。
一，列变成行例子演示
1，准备测试数据
这是基础数据表，里面有多个字段wm201403……，现在需要把N个这样的列变成行数据。
USE csdn; DROP TABLE IF EXISTS flow_table; CREATE TABLE `flow_table` ( `ID` INT(11) NOT NULL AUTO_INCREMENT, `Number` BIGINT(11) NOT NULL, `City` VARCHAR(10) NOT NULL, `wm201403` DECIMAL(7,2) DEFAULT NULL, `wm201404` DECIMAL(7,2) DEFAULT NULL, `wm201405` DECIMAL(7,2) DEFAULT NULL, `wm201406` DECIMAL(7,2) DEFAULT NULL, `wm201407` DECIMAL(7,2) DEFAULT NULL, `wm201408` DECIMAL(7,2) DEFAULT NULL, PRIMARY KEY (`ID`,`Number`) ) ENGINE=INNODB DEFAULT CHARSET=utf8;
录入一批测试数据：
INSERT INTO flow_table(Number,City,wm201403,wm201404,wm201405,wm201406,wm201407,wm201408)SELECT 1,'shanghai',100.2,180.4,141,164,124,127; INSERT INTO flow_table(Number,City,wm201403,wm201404,wm201405,wm201406,wm201407,wm201408)SELECT 2,'shanghai',110.23,180.34,141.23,104.78,124.67,127.45; INSERT INTO flow_table(Number,City,wm201403,wm201404,wm201405,wm201406,wm201407,wm201408)SELECT 3,'beijing',123.23,110.34,131.33,154.58,154.67,167.45; INSERT INTO flow_table(Number,City,wm201403,wm201404,wm201405,wm201406,wm201407,wm201408)SELECT 4,'hangzhou',0,110.34,131.33,154.58,154.67,0; INSERT INTO flow_table(Number,City,wm201405,wm201406,wm201407,wm201408)SELECT 5,'hangzhou',131.33,154.58,154.67,0;
需要达到的统计效果是：
+--------+-----------+
| Number | total_num |
+--------+-----------+
| 1 | 836.60 |
| 2 | 788.70 |
| 3 | 841.60 |
| 4 | 550.92 |
| 5 | 440.58 |
+--------+-----------+
5 rows in set (0.00 sec)
2，存储过程遍历：
这个存储过程建立了2张临时表，查询测试表数据形成游标，遍历游标根据主键Number来调用pro_flow_modify存储过程进行行列变化。代码如下：
DELIMITER $$
DROP PROCEDURE IF EXISTS csdn.`proc_all_changes`$$
CREATE PROCEDURE csdn.proc_all_changes()
BEGIN
DECLARE v_number BIGINT;
DECLARE v_city VARCHAR(10);
DECLARE _done INT DEFAULT 0;
/*定义游标*/
DECLARE cur_all CURSOR FOR SELECT Number,City FROM csdn.`flow_table`;
/**这里如果需要定义下当NOT FOUND的时候，EXIT退出游标遍历，不然如果设置成CONTINUE会一直执行下去。*/
DECLARE EXIT HANDLER FOR NOT FOUND BEGIN SET _done=1;END;
/*建立临时表，存放所有字段的临时表*/
DROP TABLE IF EXISTS flow_n_columns;
CREATE TABLE `flow_n_columns` (
`column_name` VARCHAR(10) NOT NULL
) ENGINE=INNODB DEFAULT CHARSET=utf8;
/*存放最终变成行的数据表*/
DROP TABLE IF EXISTS flow_tmp;
CREATE TABLE `flow_tmp` (
`Number` INT(11) DEFAULT NULL,
`City` VARCHAR(10) DEFAULT NULL,
`wm_str` VARCHAR(10) DEFAULT NULL,
`Wm` DECIMAL(7,2) DEFAULT NULL
) ENGINE=INNODB DEFAULT CHARSET=utf8;
OPEN cur_all;
REPEAT
FETCH cur_all INTO v_number, v_city;
IF NOT _done THEN
CALL csdn.pro_flow_modify(v_number,v_city);
END IF;
UNTIL _done=1 END REPEAT;
CLOSE cur_all;
/*展示下所有的行转列的数据**/
SELECT * FROM csdn.flow_tmp;
END$$
DELIMITER ; 3，行里变化存储过程
通过查询系统表information_schema.`COLUMNS`来获取测试表flow_table的所有列，然后写动态SQL，来把列的值录入到临时表flow_tmp中。
DELIMITER $$
DROP PROCEDURE IF EXISTS csdn.`pro_flow_modify`$$
CREATE PROCEDURE csdn.`pro_flow_modify`(p_Number INT,p_city VARCHAR(10))
BEGIN
DECLARE v_column_name VARCHAR(10) DEFAULT '';
DECLARE v_exe_sql VARCHAR(1000) DEFAULT '';
DECLARE v_start_wm VARCHAR(10) DEFAULT '';
DECLARE v_end_wm VARCHAR(10) DEFAULT '';
DECLARE v_num DECIMAL(10,2) DEFAULT 0;
DECLARE i INT DEFAULT 1;
DECLARE v_Number INT DEFAULT 0;
SET v_Number=p_Number;
DELETE FROM csdn.flow_n_columns;
DELETE FROM csdn.flow_tmp WHERE Number=v_Number;
/*把测试表flow_table的所有字段都录入字段临时表中，这样就达到了从列变成行的目的*/
INSERT INTO flow_n_columns
SELECT t.`COLUMN_NAME` FROM information_schema.`COLUMNS` t WHERE t.`TABLE_NAME`='flow_table' AND t.`TABLE_SCHEMA`='csdn' AND t.`COLUMN_NAME` NOT IN('ID','Number','City');
SELECT column_name INTO v_column_name FROM csdn.flow_n_columns LIMIT 1;
/*开始循环遍历字段临时表的字段数据，并且把字段值放入临时表flow_tmp里面*/
WHILE i>0 DO
SET v_exe_sql=CONCAT('INSERT INTO csdn.flow_tmp(Number,City,wm_str,Wm) select ',v_Number,',\'',p_city, '\',\'',v_column_name,'\',',v_column_name,' from csdn.flow_table WHERE flow_table.Number=',v_Number,';');
SET @sql=v_exe_sql;
PREPARE s1 FROM @sql;
EXECUTE s1;
DEALLOCATE PREPARE s1;
DELETE FROM csdn.flow_n_columns WHERE column_name=v_column_name;
SELECT column_name INTO v_column_name FROM csdn.flow_n_columns LIMIT 1;
SELECT COUNT(1) INTO i FROM csdn.flow_n_columns ;
DELETE FROM csdn.flow_tmp WHERE Wm=0;
END WHILE;
/*由于触发器是不支持动态sql，所以不能使用while循环，动态遍历所有统计列的，只能写死列了，如下所示：
现在一个个insert只能写死了, flow_table表有多少个统计列就写多少个insert sql，以后新添加一个列，就在这里新添加一条insertsql语句
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201403',wm201403 FROM flow_table WHERE Number=v_Number ;
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201404',wm201404 FROM flow_table WHERE Number=v_Number ;
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201405',wm201405 FROM flow_table WHERE Number=v_Number ;
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201406',wm201406 FROM flow_table WHERE Number=v_Number ;
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201407',wm201407 FROM flow_table WHERE Number=v_Number ;
INSERT INTO flow_tmp(Number,City,wm_str,Wm) SELECT v_Number,p_city,'wm201408',wm201408 FROM flow_table WHERE Number=v_Number ;
*/
/*清除掉不数据=0的列*/
DELETE FROM csdn.flow_tmp WHERE Wm=0 OR Wm IS NULL;
SELECT wm_str INTO v_start_wm FROM csdn.flow_tmp WHERE Number=v_Number ORDER BY wm_str ASC LIMIT 1;
SELECT wm_str INTO v_end_wm FROM csdn.flow_tmp WHERE Number=v_Number ORDER BY wm_str DESC LIMIT 1;
SELECT SUM(Wm) INTO v_num FROM csdn.flow_tmp WHERE Number=v_Number;
END$$
DELIMITER ; 4，列变行结果展示
临时表的所有数据：
mysql> SELECT * FROM csdn.flow_tmp; +--------+----------+----------+--------+ | Number | City | wm_str | Wm | +--------+----------+----------+--------+ | 1 | shanghai | wm201403 | 100.20 | | 1 | shanghai | wm201404 | 180.40 | | 1 | shanghai | wm201405 | 141.00 | | 1 | shanghai | wm201406 | 164.00 | | 1 | shanghai | wm201407 | 124.00 | | 1 | shanghai | wm201408 | 127.00 | | 2 | shanghai | wm201403 | 110.23 | | 2 | shanghai | wm201404 | 180.34 | | 2 | shanghai | wm201405 | 141.23 | | 2 | shanghai | wm201406 | 104.78 | | 2 | shanghai | wm201407 | 124.67 | | 2 | shanghai | wm201408 | 127.45 | | 3 | beijing | wm201403 | 123.23 | | 3 | beijing | wm201404 | 110.34 | | 3 | beijing | wm201405 | 131.33 | | 3 | beijing | wm201406 | 154.58 | | 3 | beijing | wm201407 | 154.67 | | 3 | beijing | wm201408 | 167.45 | | 4 | hangzhou | wm201404 | 110.34 | | 4 | hangzhou | wm201405 | 131.33 | | 4 | hangzhou | wm201406 | 154.58 | | 4 | hangzhou | wm201407 | 154.67 | | 5 | hangzhou | wm201405 | 131.33 | | 5 | hangzhou | wm201406 | 154.58 | | 5 | hangzhou | wm201407 | 154.67 | +--------+----------+----------+--------+ 25 rows in set (0.00 sec) mysql>
统计每个用户的使用总量为：
mysql> SELECT Number,SUM(Wm) 'total_num' FROM flow_tmp GROUP BY Number ORDER BY Number; +--------+-----------+ | Number | total_num | +--------+-----------+ | 1 | 836.60 | | 2 | 788.70 | | 3 | 841.60 | | 4 | 550.92 | | 5 | 440.58 | +--------+-----------+ 5 rows in set (0.00 sec) mysql>
二，行变列例子演示
1，准备测试数据
USE csdn; DROP TABLE IF EXISTS csdn.tb; CREATE TABLE tb(`cname` VARCHAR(10),cource VARCHAR(10),score INT) ENGINE=INNODB; INSERT INTO tb VALUES('张三','语文',74); INSERT INTO tb VALUES('张三','数学',83); INSERT INTO tb VALUES('张三','物理',93); INSERT INTO tb VALUES('李四','语文',74); INSERT INTO tb VALUES('李四','数学',84); INSERT INTO tb VALUES('李四','物理',94); SELECT * FROM tb;
+--------------------+--------+--------+--------+-----------+--------------+
| 姓名 | 语文 | 数学 | 物理 | 总成绩 | 平均成绩 |
+--------------------+--------+--------+--------+-----------+--------------+
| 张三 | 74.00 | 83.00 | 93.00 | 250.00 | 83.33 |
| 李四 | 74.00 | 84.00 | 94.00 | 252.00 | 84.00 |
| 总成绩平均数 | 74.00 | 83.50 | 93.50 | 251.00 | 83.67 |
+--------------------+--------+--------+--------+-----------+--------------+
2，利用SUM(IF()) 生成列 + WITH ROLLUP 生成汇总行,并利用 IFNULL将汇总行标题显示为 Total_num
SQL代码块如下：
SELECT cname AS "姓名", SUM(IF(cource="语文",score,0)) AS "语文", SUM(IF(cource="数学",score,0)) AS "数学", SUM(IF(cource="物理",score,0)) AS "物理", SUM(score) AS "总成绩", ROUND(AVG(score),2) AS "平均成绩" FROM tb GROUP BY cname UNION ALL SELECT "总成绩平均数", ROUND(AVG(`语文`),2) , ROUND(AVG(`数学`),2), ROUND(AVG(`物理`),2), ROUND(AVG(`总成绩`),2), ROUND(AVG(`平均成绩`),2) FROM( SELECT "all",cname AS "姓名", SUM(IF(cource="语文",score,0)) AS "语文", SUM(IF(cource="数学",score,0)) AS "数学", SUM(IF(cource="物理",score,0)) AS "物理", SUM(score) AS "总成绩", AVG(score) AS "平均成绩" FROM tb GROUP BY cname )tb2 GROUP BY tb2.all;
执行结果正确，如下所示：
+--------------------+--------+--------+--------+-----------+--------------+
| 姓名 | 语文 | 数学 | 物理 | 总成绩 | 平均成绩 |
+--------------------+--------+--------+--------+-----------+--------------+
| 张三 | 74.00 | 83.00 | 93.00 | 250.00 | 83.33 |
| 李四 | 74.00 | 84.00 | 94.00 | 252.00 | 84.00 |
| 总成绩平均数 | 74.00 | 83.50 | 93.50 | 251.00 | 83.67 |
+--------------------+--------+--------+--------+-----------+--------------+
3，利用max(CASE ... WHEN ... THEN .. ELSE END) AS "语文"的方式来实现
SQL代码如下：
SELECT cname AS "姓名", MAX(CASE cource WHEN "语文" THEN score ELSE 0 END) AS "语文", MAX(CASE cource WHEN "数学" THEN score ELSE 0 END) AS "数学", MAX(CASE cource WHEN "物理" THEN score ELSE 0 END) AS "物理", SUM(score) AS "总成绩", ROUND(AVG(score) ,2) AS "平均成绩" FROM tb GROUP BY `cname` UNION ALL SELECT "总成绩平均数", ROUND(AVG(`语文`),2) , ROUND(AVG(`数学`),2), ROUND(AVG(`物理`),2), ROUND(AVG(`总成绩`),2), ROUND(AVG(`平均成绩`),2) FROM( SELECT 'all' , cname AS "姓名", MAX(CASE cource WHEN "语文" THEN score ELSE 0 END) AS "语文", MAX(CASE cource WHEN "数学" THEN score ELSE 0 END) AS "数学", MAX(CASE cource WHEN "物理" THEN score ELSE 0 END) AS "物理", SUM(score) AS "总成绩", ROUND(AVG(score) ,2) AS "平均成绩" FROM tb GROUP BY `cname` )tb2 GROUP BY tb2.all
执行结果正确，如下所示：
+--------------------+--------+--------+--------+-----------+--------------+
| 姓名 | 语文 | 数学 | 物理 | 总成绩 | 平均成绩 |
+--------------------+--------+--------+--------+-----------+--------------+
| 张三 | 74.00 | 83.00 | 93.00 | 250.00 | 83.33 |
| 李四 | 74.00 | 84.00 | 94.00 | 252.00 | 84.00 |
| 总成绩平均数 | 74.00 | 83.50 | 93.50 | 251.00 | 83.67 |
+--------------------+--------+--------+--------+-----------+--------------+
4，利用 WITH rollup结果不符合
SQL代码如下：
SELECT IFNULL(cname,'总平均数') AS "姓名",
MAX(CASE cource WHEN "语文" THEN score ELSE 0 END) AS "语文",
MAX(CASE cource WHEN "数学" THEN score ELSE 0 END) AS "数学",
MAX(CASE cource WHEN "物理" THEN score ELSE 0 END) AS "物理",
ROUND(AVG(score),2) AS "总成绩",
ROUND(AVG(avg_score),2) AS "平均成绩"
FROM(
SELECT
cname ,
IFNULL(cource,'total') cource,
SUM(score) AS score,
ROUND(AVG(score) ,2) AS avg_score
FROM tb
GROUP BY `cname`,cource WITH ROLLUP HAVING cname IS NOT NULL
)tb2
GROUP BY tb2.cname WITH ROLLUP;
mysql> SELECT IFNULL(cname,'总平均数') AS "姓名",
-> MAX(CASE cource WHEN "语文" THEN score ELSE 0 END) AS "语文",
-> MAX(CASE cource WHEN "数学" THEN score ELSE 0 END) AS "数学",
-> MAX(CASE cource WHEN "物理" THEN score ELSE 0 END) AS "物理",
-> ROUND(AVG(score),2) AS "总成绩",
-> ROUND(AVG(avg_score),2) AS "平均成绩"
-> FROM(
-> SELECT
->
Display ALL 793 possibilities? (Y OR n)
-> cname ,
->
Display ALL 793 possibilities? (Y OR n)
-> IFNULL(cource,'total') cource,
->
Display ALL 793 possibilities? (Y OR n)
-> SUM(score) AS score,
->
Display ALL 793 possibilities? (Y OR n)
-> ROUND(AVG(score) ,2) AS avg_score
-> FROM tb
-> GROUP BY `cname`,cource WITH ROLLUP HAVING cname IS NOT NULL
-> )tb2
-> GROUP BY tb2.cname WITH ROLLUP;
+--------------+--------+--------+--------+-----------+--------------+
| 姓名 | 语文 | 数学 | 物理 | 总成绩 | 平均成绩 |
+--------------+--------+--------+--------+-----------+--------------+
| 张三 | 74 | 83 | 93 | 125.00 | 83.33 |
| 李四 | 74 | 84 | 94 | 126.00 | 84.00 |
| 总平均数 | 74 | 84 | 94 | 125.50 | 83.67 |
+--------------+--------+--------+--------+-----------+--------------+
3 ROWS IN SET, 1 warning (0.00 sec)
mysql>
总结： WITH rollup中对求列的总数是OK的，但是求列的平均数有偏差，这里场景使用不是恰当。
5，使用动态SQL来实现
SQL代码块如下：
/*仅仅班级成员部分*/
SET @a='';
SELECT @a:=CONCAT(@a,'SUM(IF(cource=\'',cource,'\'',',score,0)) AS ',cource,',') FROM (SELECT DISTINCT cource FROM tb) A;
SET @a=CONCAT(@a,"ROUND(AVG(score) ,2) AS \"平均成绩\"");
SET @b=CONCAT('SELECT IFNULL(cname,\'总成绩\'),',LEFT(@a,LENGTH(@a)-1),' ,SUM(score) AS \"总成绩\" FROM tb GROUP BY cname ');
/*班级成员总计部分**/
SET @a2="";
SET @b2=CONCAT('SELECT "all",IFNULL(cname,\'总成绩\'),',LEFT(@a,LENGTH(@a)-1),' ,SUM(score) AS \"总成绩\" FROM tb GROUP BY cname ');
SELECT @a2:=CONCAT(@a2,'ROUND(AVG(`',cource,'`),2),') FROM (SELECT DISTINCT cource FROM tb) A;
SET @a2=CONCAT(@a2," ROUND(AVG(`平均成绩`),2),ROUND(AVG(`总成绩`),2) ");
SET @c=CONCAT("SELECT \"班级平均数\",",LEFT(@a2,LENGTH(@a)-1)," FROM(",@b2,")tb2 GROUP BY tb2.all;");
SET @d=CONCAT(@b," UNION ALL ",@c);
PREPARE stmt1 FROM @d;
EXECUTE stmt1; 查看执行结果如下，已经达到效果：
mysql> /*仅仅班级成员部分*/
mysql> SET @a='';
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SELECT @a:=CONCAT(@a,'SUM(IF(cource=\'',cource,'\'',',score,0)) AS ',cource,',') FROM (SELECT DISTINCT cource FROM tb) A;
+-----------------------------------------------------------------------------------------------------------------------------------+
| @a:=CONCAT(@a,'SUM(IF(cource=\'',cource,'\'',',score,0)) AS ',cource,',') |
+-----------------------------------------------------------------------------------------------------------------------------------+
| SUM(IF(cource='语文',score,0)) AS 语文, |
| SUM(IF(cource='语文',score,0)) AS 语文,SUM(IF(cource='数学',score,0)) AS 数学, |
| SUM(IF(cource='语文',score,0)) AS 语文,SUM(IF(cource='数学',score,0)) AS 数学,SUM(IF(cource='物理',score,0)) AS 物理, |
+-----------------------------------------------------------------------------------------------------------------------------------+
3 ROWS IN SET (0.00 sec)
mysql> SET @a=CONCAT(@a,"ROUND(AVG(score) ,2) AS \"平均成绩\"");
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SET @b=CONCAT('SELECT IFNULL(cname,\'总成绩\'),',LEFT(@a,LENGTH(@a)-1),' ,SUM(score) AS \"总成绩\" FROM tb GROUP BY cname ');
QUERY OK, 0 ROWS affected (0.00 sec)
mysql>
mysql> /*班级成员总计部分**/
mysql> SET @a2="";
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SET @b2=CONCAT('SELECT "all",IFNULL(cname,\'总成绩\'),',LEFT(@a,LENGTH(@a)-1),' ,SUM(score) AS \"总成绩\" FROM tb GROUP BY cname ');
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SELECT @a2:=CONCAT(@a2,'ROUND(AVG(`',cource,'`),2),') FROM (SELECT DISTINCT cource FROM tb) A;
+-----------------------------------------------------------------------+
| @a2:=CONCAT(@a2,'ROUND(AVG(`',cource,'`),2),') |
+-----------------------------------------------------------------------+
| ROUND(AVG(`语文`),2), |
| ROUND(AVG(`语文`),2),ROUND(AVG(`数学`),2), |
| ROUND(AVG(`语文`),2),ROUND(AVG(`数学`),2),ROUND(AVG(`物理`),2), |
+-----------------------------------------------------------------------+
3 ROWS IN SET (0.00 sec)
mysql> SET @a2=CONCAT(@a2," ROUND(AVG(`平均成绩`),2),ROUND(AVG(`总成绩`),2) ");
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SET @c=CONCAT("SELECT \"班级平均数\",",LEFT(@a2,LENGTH(@a)-1)," FROM(",@b2,")tb2 GROUP BY tb2.all;");
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> SET @d=CONCAT(@b," UNION ALL ",@c);
QUERY OK, 0 ROWS affected (0.00 sec)
mysql>
mysql> PREPARE stmt1 FROM @d;
QUERY OK, 0 ROWS affected (0.00 sec)
Statement prepared
mysql> EXECUTE stmt1;
+---------------------------+--------+--------+--------+--------------+-----------+
| IFNULL(cname,'总成绩') | 语文 | 数学 | 物理 | 平均成绩 | 总成绩 |
+---------------------------+--------+--------+--------+--------------+-----------+
| 张三 | 74.00 | 83.00 | 93.00 | 83.33 | 250.00 |
| 李四 | 74.00 | 84.00 | 94.00 | 84.00 | 252.00 |
| 班级平均数 | 74.00 | 83.50 | 93.50 | 83.67 | 251.00 |
+---------------------------+--------+--------+--------+--------------+-----------+
3 ROWS IN SET (0.00 sec)
mysql>
参考文章地址：http://blog.chinaunix.net/uid-7692530-id-2567582.html
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Colorful motherboards enjoy high popularity and market share in the Chinese domestic market, but some users of Colorful motherboards still don’t know how to enter the bios for settings? In response to this situation, the editor has specially brought you two methods to enter the colorful motherboard bios. Come and try it! Method 1: Use the U disk startup shortcut key to directly enter the U disk installation system. The shortcut key for the Colorful motherboard to start the U disk with one click is ESC or F11. First, use Black Shark Installation Master to create a Black Shark U disk boot disk, and then turn on the computer. When you see the startup screen, continuously press the ESC or F11 key on the keyboard to enter a window for sequential selection of startup items. Move the cursor to the place where "USB" is displayed, and then
How to recover deleted contacts on WeChat (simple tutorial tells you how to recover deleted contacts)
May 01, 2024 pm 12:01 PM
Unfortunately, people often delete certain contacts accidentally for some reasons. WeChat is a widely used social software. To help users solve this problem, this article will introduce how to retrieve deleted contacts in a simple way. 1. Understand the WeChat contact deletion mechanism. This provides us with the possibility to retrieve deleted contacts. The contact deletion mechanism in WeChat removes them from the address book, but does not delete them completely. 2. Use WeChat’s built-in “Contact Book Recovery” function. WeChat provides “Contact Book Recovery” to save time and energy. Users can quickly retrieve previously deleted contacts through this function. 3. Enter the WeChat settings page and click the lower right corner, open the WeChat application "Me" and click the settings icon in the upper right corner to enter the settings page.
Summary of methods to obtain administrator rights in Win11
Mar 09, 2024 am 08:45 AM
A summary of how to obtain Win11 administrator rights. In the Windows 11 operating system, administrator rights are one of the very important permissions that allow users to perform various operations on the system. Sometimes, we may need to obtain administrator rights to complete some operations, such as installing software, modifying system settings, etc. The following summarizes some methods for obtaining Win11 administrator rights, I hope it can help you. 1. Use shortcut keys. In Windows 11 system, you can quickly open the command prompt through shortcut keys.
Quickly master: How to open two WeChat accounts on Huawei mobile phones revealed!
Mar 23, 2024 am 10:42 AM
In today's society, mobile phones have become an indispensable part of our lives. As an important tool for our daily communication, work, and life, WeChat is often used. However, it may be necessary to separate two WeChat accounts when handling different transactions, which requires the mobile phone to support logging in to two WeChat accounts at the same time. As a well-known domestic brand, Huawei mobile phones are used by many people. So what is the method to open two WeChat accounts on Huawei mobile phones? Let’s reveal the secret of this method. First of all, you need to use two WeChat accounts at the same time on your Huawei mobile phone. The easiest way is to
The secret of hatching mobile dragon eggs is revealed (step by step to teach you how to successfully hatch mobile dragon eggs)
May 04, 2024 pm 06:01 PM
Mobile games have become an integral part of people's lives with the development of technology. It has attracted the attention of many players with its cute dragon egg image and interesting hatching process, and one of the games that has attracted much attention is the mobile version of Dragon Egg. To help players better cultivate and grow their own dragons in the game, this article will introduce to you how to hatch dragon eggs in the mobile version. 1. Choose the appropriate type of dragon egg. Players need to carefully choose the type of dragon egg that they like and suit themselves, based on the different types of dragon egg attributes and abilities provided in the game. 2. Upgrade the level of the incubation machine. Players need to improve the level of the incubation machine by completing tasks and collecting props. The level of the incubation machine determines the hatching speed and hatching success rate. 3. Collect the resources required for hatching. Players need to be in the game
Detailed explanation of Oracle version query method
Mar 07, 2024 pm 09:21 PM
Detailed explanation of Oracle version query method Oracle is one of the most popular relational database management systems in the world. It provides rich functions and powerful performance and is widely used in enterprises. In the process of database management and development, it is very important to understand the version of the Oracle database. This article will introduce in detail how to query the version information of the Oracle database and give specific code examples. Query the database version of the SQL statement in the Oracle database by executing a simple SQL statement
