Tags make it possible to associate custom key/value pairs to aCluster, storing them in its metadata. Custom tag names can be any string starting with letters and followed by letters, numbers and _. Tag values may be any JSON value. If the value is null, the tag is deleted. ...
When dealing with big numbers (above JavaScript Number precision limit), you should consider enablingsupportBigNumbersoption to be able to read the insert id as a string, otherwise it will throw an error. This option is also required when fetching big numbers from the database, otherwise you ...
don't abstract all numbers to N and strings to 'S' -n NUM abstract numbers with at least n digits within names -g PATTERN 正则匹配;grep: only consider stmts that include this string -h HOSTNAME mysql机器名或者IP;hostname of db server for *-slow.log filename (can be wildcard), defa...
Bug #51859Order (sort) by numbers are wrong Submitted:9 Mar 2010 11:24Modified:9 Mar 2010 11:38 Reporter:olaf ockeEmail Updates: Status:ClosedImpact on me: None Category:MySQL Workbench: SQL EditorSeverity:S3 (Non-critical) Version:5.2.16OS:MacOS ...
mysql order by where mysql order by where组合索引 建立索引 建立索引是优化查询的一种方式,我们通常会对where列上建立相关索引,可以是单列的索引,也可以是复合索引。 加索引要注意 在where、order by的相关列上可以考虑添加索引; 如果where列中已经存在索引,order by列的索引(假设存在)不会被利用(explain显示...
The value in col_num is replaced by the corresponding value. There can be more than one col_num/value pair. Column numbers start with 1. A replacement value can be double-quoted. (Use “"” to specify a double quote within a replacement string.) Variables can be used in a replacement...
orderby niddesc limit 10; 执行计划 explain + 查询SQL – 用于显示SQL执行信息参数,根据参考信息可以进行SQL优化 1 2 3 4 5 6 7 mysql> explainselect*fromtb2; +---+---+---+---+---+---+---+---+---+---+ | id | select_type |table| type | possible_keys |key| key_len | ...
query time-r reverse the sortorder(largest last insteadoffirst)-tNUMjust show the top n queries-a don't abstract all numbers to N and strings to 'S'-nNUMabstract numberswithat least n digits within names-gPATTERNgrep:only consider stmts that includethisstring-hHOSTNAMEhostnameofdb server...
It should be possible to do it in an ORDER BY with * 0+ to convert to numeric * IFNULL instead of NULLS first and use * MID and INSTR (see below) * other functions from http://dev.mysql.com/doc/refman/5.6/en/string-functions.html ...
Re: How can I convert from string to decimal and order by asc Posted by:Tom Melly Date: October 02, 2009 07:13AM Ouch! You probably had decimal(4,2) (4 numbers in total, with 2 after the decimal point). Decimal is an 'odd' numeric type - essentially, it's really stored as an...