Merge pull request #5989 from taosdata/docs/Update-Latest-Feature
Docs/update latest feature
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Elias Soong
GitHub
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cd5767f40a
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@ -16,7 +16,6 @@ TDengine 的 JDBC 驱动实现尽可能与关系型数据库驱动保持一致
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* TDengine 目前不支持针对单条数据记录的删除操作。
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* 目前不支持事务操作。
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* 目前不支持表间的 union 操作。
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* 目前不支持嵌套查询（nested query）。
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* 对每个 Connection 的实例，至多只能有一个打开的 ResultSet 实例；如果在 ResultSet 还没关闭的情况下执行了新的查询，taos-jdbcdriver 会自动关闭上一个 ResultSet。
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@ -447,7 +446,7 @@ Query OK, 1 row(s) in set (0.000141s)
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## TAOS-JDBCDriver 版本以及支持的 TDengine 版本和 JDK 版本
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## <a class="anchor" id="version"></a>TAOS-JDBCDriver 版本以及支持的 TDengine 版本和 JDK 版本
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| taos-jdbcdriver 版本 | TDengine 版本 | JDK 版本 |
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| -------------------- | ----------------- | -------- |
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@ -144,7 +144,7 @@ TDengine集群中加入一个新的dnode时，涉及集群相关的一些参数
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- numOfMnodes：系统中管理节点个数。默认值：3。
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- balance：是否启动负载均衡。0：否，1：是。默认值：1。
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- mnodeEqualVnodeNum: 一个mnode等同于vnode消耗的个数。默认值：4。
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- offlineThreshold: dnode离线阈值，超过该时间将导致该dnode从集群中删除。单位为秒，默认值：86400*100（即100天）。
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- offlineThreshold: dnode离线阈值，超过该时间将导致该dnode从集群中删除。单位为秒，默认值：86400*10（即10天）。
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- statusInterval: dnode向mnode报告状态时长。单位为秒，默认值：1。
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- maxTablesPerVnode: 每个vnode中能够创建的最大表个数。默认值：1000000。
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- maxVgroupsPerDb: 每个数据库中能够使用的最大vgroup个数。
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@ -462,31 +462,31 @@ TDengine的所有可执行文件默认存放在 _/usr/local/taos/bin_ 目录下
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| 关键字列表 | | | | |
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| ---------- | ----------- | ------------ | ---------- | --------- |
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| ABLOCKS | CONNECTIONS | HAVING | MODULES | SLIMIT |
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| ABORT | COPY | ID | NCHAR | SMALLINT |
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| ACCOUNT | COUNT | IF | NE | SPREAD |
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| ACCOUNTS | CREATE | IGNORE | NONE | STABLE |
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| ADD | CTIME | IMMEDIATE | NOT | STABLES |
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| AFTER | DATABASE | IMPORT | NOTNULL | STAR |
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| ALL | DATABASES | IN | NOW | STATEMENT |
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| ALTER | DAYS | INITIALLY | OF | STDDEV |
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| AND | DEFERRED | INSERT | OFFSET | STREAM |
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| AS | DELIMITERS | INSTEAD | OR | STREAMS |
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| ASC | DESC | INTEGER | ORDER | STRING |
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| ATTACH | DESCRIBE | INTERVAL | PASS | SUM |
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| AVG | DETACH | INTO | PERCENTILE | TABLE |
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| BEFORE | DIFF | IP | PLUS | TABLES |
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| BEGIN | DISTINCT | IS | PRAGMA | TAG |
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| BETWEEN | DIVIDE | ISNULL | PREV | TAGS |
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| BIGINT | DNODE | JOIN | PRIVILEGE | TBLOCKS |
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| BINARY | DNODES | KEEP | QUERIES | TBNAME |
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| BITAND | DOT | KEY | QUERY | TIMES |
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| BITNOT | DOUBLE | KILL | RAISE | TIMESTAMP |
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| BITOR | DROP | LAST | REM | TINYINT |
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| BOOL | EACH | LE | REPLACE | TOP |
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| BOTTOM | END | LEASTSQUARES | REPLICA | TOPIC |
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| BY | EQ | LIKE | RESET | TRIGGER |
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| CACHE | EXISTS | LIMIT | RESTRICT | UMINUS |
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| ABLOCKS | CONNECTIONS | HAVING | MODULES | SMALLINT |
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| ABORT | COPY | ID | NCHAR | SPREAD |
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| ACCOUNT | COUNT | IF | NE | STABLE |
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| ACCOUNTS | CREATE | IGNORE | NONE | STABLES |
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| ADD | CTIME | IMMEDIATE | NOT | STAR |
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| AFTER | DATABASE | IMPORT | NOTNULL | STATEMENT |
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| ALL | DATABASES | IN | NOW | STDDEV |
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| ALTER | DAYS | INITIALLY | OF | STREAM |
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| AND | DEFERRED | INSERT | OFFSET | STREAMS |
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| AS | DELIMITERS | INSTEAD | OR | STRING |
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| ASC | DESC | INTEGER | ORDER | SUM |
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| ATTACH | DESCRIBE | INTERVAL | PASS | TABLE |
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| AVG | DETACH | INTO | PERCENTILE | TABLES |
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| BEFORE | DIFF | IP | PLUS | TAG |
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| BEGIN | DISTINCT | IS | PRAGMA | TAGS |
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| BETWEEN | DIVIDE | ISNULL | PREV | TBLOCKS |
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| BIGINT | DNODE | JOIN | PRIVILEGE | TBNAME |
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| BINARY | DNODES | KEEP | QUERIES | TIMES |
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| BITAND | DOT | KEY | QUERY | TIMESTAMP |
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| BITNOT | DOUBLE | KILL | RAISE | TINYINT |
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| BITOR | DROP | LAST | REM | TOP |
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| BOOL | EACH | LE | REPLACE | TOPIC |
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| BOTTOM | END | LEASTSQUARES | REPLICA | TRIGGER |
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| BY | EQ | LIKE | RESET | UMINUS |
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| CACHE | EXISTS | LIMIT | RESTRICT | UNION |
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| CASCADE | EXPLAIN | LINEAR | ROW | UPLUS |
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| CHANGE | FAIL | LOCAL | ROWS | USE |
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| CLOG | FILL | LP | RP | USER |
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@ -498,5 +498,5 @@ TDengine的所有可执行文件默认存放在 _/usr/local/taos/bin_ 目录下
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| CONCAT | GLOB | METRICS | SHOW | VIEW |
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| CONFIGS | GRANTS | MIN | SLASH | WAVG |
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| CONFLICT | GROUP | MINUS | SLIDING | WHERE |
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| CONNECTION | GT | MNODES | | |
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| CONNECTION | GT | MNODES | SLIMIT | |
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@ -407,7 +407,7 @@ SELECT select_expr [, select_expr ...]
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[INTERVAL (interval_val [, interval_offset])]
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[SLIDING sliding_val]
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[FILL fill_val]
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[GROUP BY col_list <!-- [HAVING having_condition] -->]
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[GROUP BY col_list]
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[ORDER BY col_list { DESC | ASC }]
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[SLIMIT limit_val [SOFFSET offset_val]]
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[LIMIT limit_val [OFFSET offset_val]]
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@ -647,7 +647,7 @@ Query OK, 1 row(s) in set (0.001091s)
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3. 从 2.0.17 版本开始，条件过滤开始支持 BETWEEN AND 语法，例如 `WHERE col2 BETWEEN 1.5 AND 3.25` 表示查询条件为“1.5 ≤ col2 ≤ 3.25”。
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<!--
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### GROUP BY 之后的 HAVING 过滤
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### <a class="anchor" id="having"></a>GROUP BY 之后的 HAVING 过滤
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从 2.0.20 版本开始，GROUP BY 之后允许再跟一个 HAVING 子句，对成组后的各组数据再做筛选。HAVING 子句可以使用聚合函数和选择函数作为过滤条件（但暂时不支持 LEASTSQUARES、TOP、BOTTOM、LAST_ROW）。
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@ -657,6 +657,16 @@ SELECT AVG(f1), SPREAD(f1, f2, st2.f1) FROM st2 WHERE f1 > 0 GROUP BY f1 HAVING
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```
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-->
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### <a class="anchor" id="union"></a>UNION ALL 操作符
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```mysql
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SELECT ...
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UNION ALL SELECT ...
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[UNION ALL SELECT ...]
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```
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TDengine 支持 UNION ALL 操作符。也就是说，如果多个 SELECT 子句返回结果集的结构完全相同（列名、列类型、列数、顺序），那么可以通过 UNION ALL 把这些结果集合并到一起。目前只支持 UNION ALL 模式，也即在结果集的合并过程中是不去重的。
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### SQL 示例
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- 对于下面的例子，表tb1用以下语句创建
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