On many systems, this means that ROUND() uses the “round to nearest even” rule: A value with a fractional part exactly half way between two integers is rounded to the nearest even integer. The following example shows how rounding differs for exact and approximate values: ...
ROUND_HALF_EVEN Rounding mode to round towards the "nearest neighbor" unless both neighbors are equidistant, in which case, round towards the even neighbor. 1. 2. 向(距离)最近的一边舍入,除非两边(的距离)是相等,如果是这样,如果保留位数是奇数,使用ROUND_HALF_UP ,如果是偶数,使用ROUND_HALF_DOWN ...
each user connection no longer has its own dedicated OS thread to execute statements. Instead, the Thread Pool is composed of Thread Groups, with a default of 16 Thread Groups. User connection is assigned to Thread Group in a round-robin fashion. Each Thread Group manages...
depending on the type of the first argument: · For exact-value numbers, ROUND() uses the “round half away from zero” or “round toward nearest” rule: A value with a fractional part of .5 or greater is rounded up to the next integer if positive or down to the next integer if ...
Replication: If theWAIT_FOR_EXECUTED_GTID_SET()function was used with a timeout value including a fractional part (for example, 1.5), an error in the casting logic meant that the timeout was rounded down to the nearest whole second, and to zero for values less than 1 second (for exampl...
--innodb-ft-sort-pll-degree=# InnoDB Fulltext search parallel sort degree, will round up to nearest power of 2 number --innodb-ft-total-cache-size=# Total memory allocated for InnoDB Fulltext Search cache --innodb-ft-user-stopword-table[=name] User supplied stopword table name, effective...
• round, which rounds the date to the nearest closest value which is 0001-01-01. Starting with Connector/J 3.1.7, ResultSet.getString() can be decoupled from this behavior using noDatetimeStringSync=true (the default value is false) so that you can retrieve the unaltered all-zero ...
options on the command line or in an option file. Most of them can be changed dynamically while the server is running by means of theSETstatement, which enables you to modify operation of the server without having to stop and restart it. You can refer to system variable values in ...
类型可以是BINARY, CHAR, DATE, DATETIME, SIGNED (INTEGER),和UNSIGNED (INTEGER)。 通常MySQL会自动帮你改变类型。 其它函式 benchmark(count, expression) 这个函式是用来测试查询的速度,只会传回0值。 encrypt(s[,salt]) 将s加密用Unix的加密系统。salt字符串是两个字符的字符串,可以不用。
InnoDB Fulltext search parallel sort degree, will round up to nearest power of 2 number --innodb-ft-total-cache-size=# Total memory allocated for InnoDB Fulltext Search cache --innodb-ft-user-stopword-table[=name] User supplied stopword table name, effective in the session level. ...