MySQL统计信息相关的参数：1. innodb_stats_on_metadata（是否自动更新统计信息），MySQL 5.7中默认为关闭状态仅在统计信息配置为非持久化的时候生效。 也就是说在innodb_stats_persistent 配置为OFF的时候，非持久化存储统计信息的手，innodb_stats_on_metadata的设置才生效。 当innodb_stats_on_metadata设置为ON的时候， InnoDB在执show table status 或者访问INFORMATION_SCHEMA.TABLES 或者INFORMATION_...
SELECT table_name, table_rows, index_length, data_length, auto_increment, create_time, update_time, table_collation, ENGINE FROM INFORMATION_SCHEMA. TABLES WHERE table_schema = ‘yunprint‘ 作者:: 绰号:老哇的爪子claw of Eagle 偶像破坏者Iconoclast image-smasher 捕鸟王"Bird Catcher kok 虔诚者Pious 宗教信仰捍卫者 Defender Of the Faith. 卡拉卡拉红斗篷 Caracalla red cloak 万兽之王 简称：：...
！ MySQL 查询某个列中同样值的数量统计标签：blog gravity group mat ext style mysq font from 本文系统来源：http://www.cnblogs.com/brucemengbm/p/6801275.html
-uroot -p‘root‘ extended-status -i1|awk ‘BEGIN{local_switch=0;print "QPS Commit Rollback TPS Threads_con Threads_run \n------------------------------------------------------- "} $2 ~ /Queries$/ {q=$4-lq;lq=$4;}$2 ~ /Com_commit$/ {c=$4-lc;lc=$4;}$2 ~ /Com_rollback$/ {r=$4-lr;lr=$4;}$2 ~ /Threads_connected$/ {tc=$4;}$2 ~ /Threads_running$/ {tr=$4;if(local_switc...
说明1 2 3 4 5SELECT YEAR(‘2014-10-29‘) //2014 SELECT MONTH(‘2014-10-29‘) //10 SELECT DAY(‘2014-10-29‘) //29 SELECT QUARTER(‘2014-10-29‘) //4 季度 SELECT DAYOFWEEK(‘2014-10-29‘) //4 星期一、年度查询查询本年度的数据1 2 3 SELECT * FROM blog_article WHERE year( FROM_UNIXTIME( BlogCreateTime ) ) = year( curdate( ))二、查询季度数据查询数据附带季度数1 2 SELECT ArticleId, quarter( FROM_UN...
产品表 CREATE TABLE `product` (`product_id` int(11) NOT NULL AUTO_INCREMENT,`product_model` varchar(255) NOT NULL,`product_price` decimal(15,4) NOT NULL, `product_status` tinyint(1) unsigned NOT NULL,`product_add_time` int(11) unsigned DEFAULT ‘0‘,PRIMARY KEY (`product_id`),KEY `product_price` (`product_price`) USING BTREE ) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=utf-8分类表 CREATE T...
CREATE PROCEDURE developer_count ( searchType int, startTime varchar(64), endTime varchar(64) ) BEGIN /*定义变量天数*/ declare day_num int; if searchType = 1 then /*本周数据查询*/ select count(d.acct_id),d.acct_old_time from developer d where 1=1 and DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(d.acct_old_time) GROUP BY d.acct_old_time; end if...
想要同时统计男生数量和不及格数量。SELECT COUNT(1) AS boyNum FROM t_student WHERE sex=‘男‘; SELECT COUNT(1) AS poorNum FROM t_student WHERE score<‘60‘; 失败的尝试：SELECT COUNT(sex=‘男‘) AS boyNum, COUNT(score<‘60‘) AS poorNum FROM t_student; 解决方法:mysql提供if函数，可以在查询是使用。SELECTSUM(IF((sex=‘男‘),1,0)) ‘boyNum’,SUM(IF((score<‘60‘),1,0)) ‘poorNum’FROM t_student;mysql统计...
分组后，统计记录条数：SELECT num,count(*) AS counts from test_a GROUP BY num; 查询结果如下： 对num去重后的数量的统计：SELECT count(t.counts) FROM ( SELECT num,count(*) AS counts from test_a GROUP BY num ) AS t;SELECT count(DISTINCT num) AS count FROM test_a;它俩结果一样，都是5；只是一个是子查询（嵌套），一个是内置函数 dietinct（）； 数据库结构 MySQL 分组后，统计记录条数标签：技术分享 结构 ...
mysql slow log中很多sql 语句结构和对象是相同，只是其中变量不一样，对于这样的sql,我们完全可以将其归为一类，统计其执行次数、执行时间平均值等参数，而pt-query-digest恰好就是这样一款工具，能够对slow sql 进行归类、分组和分析，统计同一类sql多次运行后的参数:max、min、avg、count等:# Query 6: 0.23QPS, 1.07x concurrency, ID 0x7F4D624CEA244E17 at byte 17591954 # This item isincluded in the report because it m...
select DATE_FORMAT(create_time,‘%Y%m%d‘) days,count(caseid) count from tc_case group by days; select DATE_FORMAT(create_time,‘%Y%m‘) months,count(caseid) count from tc_case group by months; DATE_FORMAT(date,format) 根据format字符串格式化date值。下列修饰符可以被用在format字符串中： %M 月名字(January……December) %W 星期名字(Sunday……Saturday) %D 有英语前缀的月份的日期(1st, 2nd, 3rd, 等等。...
select A.user_id,ifnull(sum(ifnull(A.ex_cpu,0)),0) AS a0, ifnull(sum(ifnull(A.ex_mem,0)),0) AS a1, ifnull(sum(ifnull(A.ex_disk,0)),0) AS a2, ifnull(sum(ifnull(B.cpu,0)),0) AS a3, ifnull(sum(ifnull(B.mem,0)),0) AS a4, ifnull(sum(ifnull(B.disk,0)),0) AS a5 from tbl_service_instance as A left join tbl_service_spec as B on A.service_spec_id = B.id where A.env_id ="84d97900-8d24-4904-984e-e49d6809e3af"...
#!/usr/bin/pythonimport os,sys,pymysqlmysqlbase = ‘/usr/local/mysql/bin/‘if len(sys.argv) == 1: print(‘format: python + Script_name + user + password + ip‘)elif sys.argv[1] == ‘-h‘: print(‘format: python + Script_name + user + password + ip‘)else: user = sys.argv[1] passw = sys.argv[2] ip = sys.argv[3] dbnam=os.popen(mysqlbase+‘mysql -h‘+ip+‘ -u‘+user+‘ -p‘+passw+...
sum(case when identify_type=01 then 1 else 0 end ), sum(case when identify_type=02 then 1 else 0 end ), sum(case when identify_type=03 then 1 else 0 end ) FROM `user_info`; mysql 一个表内根据字段对应值不同查询统计总数标签：分享 images rom identify http src 技术分享 when mysq 本文系统来源：http://www.cnblogs.com/jiafeimao-dabai/p/7737259.html
举例子：一个user表 有user_id自增主键，还有create_time用户创建时间 业务需求 让你统计每天用户的总量和相比前一天增加了多少用户量如图表二这种。首先将每天的总量查出来 表中的时间一般为date_time类型 所以用个函数 SELECT DATE_FORMAT(create_time,‘%Y-%m-%d‘) dd,COUNT(*) num FROM USER GROUP BY DATE_FORMAT(create_time,‘%y-%m-%d‘)将上一个SQL作为一个统计表来计算增量 上SQL。各位可以自己试试SELECT a.dd,a...