帮助语句有哪几类？
SHOW HELP 语句
展示 DRDS 所有辅助 SQL 指令及其说明。
mysql> show help;
+-----------------------------------------+---------------------------------------------------------+---------------------------------------------+
| STATEMENT | DESCRIPTION | EXAMPLE |
+-----------------------------------------+---------------------------------------------------------+---------------------------------------------+
| show rule | Report all table rule | |
| show rule from TABLE | Report table rule | show rule from user |
| show full rule from TABLE | Report table full rule | show full rule from user |
| show topology from TABLE | Report table physical topology | show topology from user |
| show partitions from TABLE | Report table dbPartition or tbPartition columns | show partitions from user |
| show broadcasts | Report all broadcast tables | |
| show datasources | Report all partition db threadPool info | |
| show node | Report master/slave read status | |
| show slow | Report top 100 slow sql | |
| show physical_slow | Report top 100 physical slow sql | |
| clear slow | Clear slow data | |
| trace SQL | Start trace sql, use show trace to print profiling data | trace select count(*) from user; show trace |
| show trace | Report sql execute profiling info | |
| explain SQL | Report sql plan info | explain select count(*) from user |
| explain detail SQL | Report sql detail plan info | explain detail select count(*) from user |
| explain execute SQL | Report sql on physical db plan info | explain execute select count(*) from user |
| show sequences | Report all sequences status | |
| create sequence NAME [start with COUNT] | Create sequence | create sequence test start with 0 |
| alter sequence NAME [start with COUNT] | Alter sequence | alter sequence test start with 100000 |
| drop sequence NAME | Drop sequence | drop sequence test |
+-----------------------------------------+---------------------------------------------------------+---------------------------------------------+
20 rows in set (0.00 sec)
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