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docs: refine keywords section and add delete keywords

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docs/en/12-taos-sql/12-keywords.md
浏览文件 @ 282582a3
......@@ -4,45 +4,312 @@ title: Keywords
There are about 200 keywords reserved by TDengine, they can't be used as the name of database, STable or table with either upper case, lower case or mixed case.
**Keywords List**
| | | | | |
| ----------- | ---------- | --------- | ---------- | ------------ |
| ABORT | CREATE | IGNORE | NULL | STAR |
| ACCOUNT | CTIME | IMMEDIATE | OF | STATE |
| ACCOUNTS | DATABASE | IMPORT | OFFSET | STATEMENT |
| ADD | DATABASES | IN | OR | STATE_WINDOW |
| AFTER | DAYS | INITIALLY | ORDER | STORAGE |
| ALL | DBS | INSERT | PARTITIONS | STREAM |
| ALTER | DEFERRED | INSTEAD | PASS | STREAMS |
| AND | DELIMITERS | INT | PLUS | STRING |
| AS | DESC | INTEGER | PPS | SYNCDB |
| ASC | DESCRIBE | INTERVAL | PRECISION | TABLE |
| ATTACH | DETACH | INTO | PREV | TABLES |
| BEFORE | DISTINCT | IS | PRIVILEGE | TAG |
| BEGIN | DIVIDE | ISNULL | QTIME | TAGS |
| BETWEEN | DNODE | JOIN | QUERIES | TBNAME |
| BIGINT | DNODES | KEEP | QUERY | TIMES |
| BINARY | DOT | KEY | QUORUM | TIMESTAMP |
| BITAND | DOUBLE | KILL | RAISE | TINYINT |
| BITNOT | DROP | LE | REM | TOPIC |
| BITOR | EACH | LIKE | REPLACE | TOPICS |
| BLOCKS | END | LIMIT | REPLICA | TRIGGER |
| BOOL | EQ | LINEAR | RESET | TSERIES |
| BY | EXISTS | LOCAL | RESTRICT | UMINUS |
| CACHE | EXPLAIN | LP | ROW | UNION |
| CACHELAST | FAIL | LSHIFT | RP | UNSIGNED |
| CASCADE | FILE | LT | RSHIFT | UPDATE |
| CHANGE | FILL | MATCH | SCORES | UPLUS |
| CLUSTER | FLOAT | MAXROWS | SELECT | USE |
| COLON | FOR | MINROWS | SEMI | USER |
| COLUMN | FROM | MINUS | SESSION | USERS |
| COMMA | FSYNC | MNODES | SET | USING |
| COMP | GE | MODIFY | SHOW | VALUES |
| COMPACT | GLOB | MODULES | SLASH | VARIABLE |
| CONCAT | GRANTS | NCHAR | SLIDING | VARIABLES |
| CONFLICT | GROUP | NE | SLIMIT | VGROUPS |
| CONNECTION | GT | NONE | SMALLINT | VIEW |
| CONNECTIONS | HAVING | NOT | SOFFSET | VNODES |
| CONNS | ID | NOTNULL | STable | WAL |
| COPY | IF | NOW | STableS | WHERE |
## Keywords List
### A
- ABORT
- ACCOUNT
- ACCOUNTS
- ADD
- AFTER
- ALL
- ALTER
- AND
- AS
- ASC
- ATTACH
### B
- BEFORE
- BEGIN
- BETWEEN
- BIGINT
- BINARY
- BITAND
- BITNOT
- BITOR
- BLOCKS
- BOOL
- BY
### C
- CACHE
- CACHELAST
- CASCADE
- CHANGE
- CLUSTER
- COLON
- COLUMN
- COMMA
- COMP
- COMPACT
- CONCAT
- CONFLICT
- CONNECTION
- CONNECTIONS
- CONNS
- COPY
- CREATE
- CTIME
### D
- DATABASE
- DATABASES
- DAYS
- DBS
- DEFERRED
- DELETE
- DELIMITERS
- DESC
- DESCRIBE
- DETACH
- DISTINCT
- DIVIDE
- DNODE
- DNODES
- DOT
- DOUBLE
- DROP
### E
- END
- EQ
- EXISTS
- EXPLAIN
### F
- FAIL
- FILE
- FILL
- FLOAT
- FOR
- FROM
- FSYNC
### G
- GE
- GLOB
- GRANTS
- GROUP
- GT
### H
- HAVING
### I
- ID
- IF
- IGNORE
- IMMEDIA
- IMPORT
- IN
- INITIAL
- INSERT
- INSTEAD
- INT
- INTEGER
- INTERVA
- INTO
- IS
- ISNULL
### J
- JOIN
### K
- KEEP
- KEY
- KILL
### L
- LE
- LIKE
- LIMIT
- LINEAR
- LOCAL
- LP
- LSHIFT
- LT
### M
- MATCH
- MAXROWS
- MINROWS
- MINUS
- MNODES
- MODIFY
- MODULES
### N
- NE
- NONE
- NOT
- NOTNULL
- NOW
- NULL
### O
- OF
- OFFSET
- OR
- ORDER
### P
- PARTITION
- PASS
- PLUS
- PPS
- PRECISION
- PREV
- PRIVILEGE
### Q
- QTIME
- QUERIE
- QUERY
- QUORUM
### R
- RAISE
- REM
- REPLACE
- REPLICA
- RESET
- RESTRIC
- ROW
- RP
- RSHIFT
### S
- SCORES
- SELECT
- SEMI
- SESSION
- SET
- SHOW
- SLASH
- SLIDING
- SLIMIT
- SMALLIN
- SOFFSET
- STable
- STableS
- STAR
- STATE
- STATEMEN
- STATE_WI
- STORAGE
- STREAM
- STREAMS
- STRING
- SYNCDB
### T
- TABLE
- TABLES
- TAG
- TAGS
- TBNAME
- TIMES
- TIMESTAMP
- TINYINT
- TOPIC
- TOPICS
- TRIGGER
- TSERIES
### U
- UMINUS
- UNION
- UNSIGNED
- UPDATE
- UPLUS
- USE
- USER
- USERS
- USING
### V
- VALUES
- VARIABLE
- VARIABLES
- VGROUPS
- VIEW
- VNODES
### W
- WAL
- WHERE
### _
- _C0
- _QSTART
- _QSTOP
- _QDURATION
- _WSTART
- _WSTOP
- _WDURATION
## Explanations
### TBNAME
`TBNAME` can be considered as a special tag, which represents the name of the subtable, in STable.
Get the table name and tag values of all subtables in a STable.
```mysql
SELECT TBNAME, location FROM meters;
```
Count the number of subtables in a STable.
```mysql
SELECT COUNT(TBNAME) FROM meters;
```
Only filter on TAGS can be used in WHERE clause in the above two query statements.
```mysql
taos> SELECT TBNAME, location FROM meters;
tbname | location |
==================================================================
d1004 | California.SanFrancisco |
d1003 | California.SanFrancisco |
d1002 | California.LosAngeles |
d1001 | California.LosAngeles |
Query OK, 4 row(s) in set (0.000881s)
taos> SELECT COUNT(tbname) FROM meters WHERE groupId > 2;
count(tbname) |
========================
2 |
Query OK, 1 row(s) in set (0.001091s)
```
### _QSTART/_QSTOP/_QDURATION
The start, stop and duration of a query time window (Since version 2.6.0.0).
### _WSTART/_WSTOP/_WDURATION
The start, stop and duration of aggegate query by time window, like interval, session window, state window (Since version 2.6.0.0).
### _c0
The first column of a table or STable.
docs/zh/12-taos-sql/12-keywords/index.md
浏览文件 @ 282582a3
......@@ -45,43 +45,311 @@ title: TDengine 参数限制与保留关键字
目前 TDengine 有将近 200 个内部保留关键字，这些关键字无论大小写均不可以用作库名、表名、STable 名、数据列名及标签列名等。这些关键字列表如下：
| 关键字列表 | | | | |
| ----------- | ---------- | --------- | ---------- | ------------ |
| ABORT | CREATE | IGNORE | NULL | STAR |
| ACCOUNT | CTIME | IMMEDIATE | OF | STATE |
| ACCOUNTS | DATABASE | IMPORT | OFFSET | STATEMENT |
| ADD | DATABASES | IN | OR | STATE_WINDOW |
| AFTER | DAYS | INITIALLY | ORDER | STORAGE |
| ALL | DBS | INSERT | PARTITIONS | STREAM |
| ALTER | DEFERRED | INSTEAD | PASS | STREAMS |
| AND | DELIMITERS | INT | PLUS | STRING |
| AS | DESC | INTEGER | PPS | SYNCDB |
| ASC | DESCRIBE | INTERVAL | PRECISION | TABLE |
| ATTACH | DETACH | INTO | PREV | TABLES |
| BEFORE | DISTINCT | IS | PRIVILEGE | TAG |
| BEGIN | DIVIDE | ISNULL | QTIME | TAGS |
| BETWEEN | DNODE | JOIN | QUERIES | TBNAME |
| BIGINT | DNODES | KEEP | QUERY | TIMES |
| BINARY | DOT | KEY | QUORUM | TIMESTAMP |
| BITAND | DOUBLE | KILL | RAISE | TINYINT |
| BITNOT | DROP | LE | REM | TOPIC |
| BITOR | EACH | LIKE | REPLACE | TOPICS |
| BLOCKS | END | LIMIT | REPLICA | TRIGGER |
| BOOL | EQ | LINEAR | RESET | TSERIES |
| BY | EXISTS | LOCAL | RESTRICT | UMINUS |
| CACHE | EXPLAIN | LP | ROW | UNION |
| CACHELAST | FAIL | LSHIFT | RP | UNSIGNED |
| CASCADE | FILE | LT | RSHIFT | UPDATE |
| CHANGE | FILL | MATCH | SCORES | UPLUS |
| CLUSTER | FLOAT | MAXROWS | SELECT | USE |
| COLON | FOR | MINROWS | SEMI | USER |
| COLUMN | FROM | MINUS | SESSION | USERS |
| COMMA | FSYNC | MNODES | SET | USING |
| COMP | GE | MODIFY | SHOW | VALUES |
| COMPACT | GLOB | MODULES | SLASH | VARIABLE |
| CONCAT | GRANTS | NCHAR | SLIDING | VARIABLES |
| CONFLICT | GROUP | NE | SLIMIT | VGROUPS |
| CONNECTION | GT | NONE | SMALLINT | VIEW |
| CONNECTIONS | HAVING | NOT | SOFFSET | VNODES |
| CONNS | ID | NOTNULL | STABLE | WAL |
| COPY | IF | NOW | STABLES | WHERE |
### A
- ABORT
- ACCOUNT
- ACCOUNTS
- ADD
- AFTER
- ALL
- ALTER
- AND
- AS
- ASC
- ATTACH
### B
- BEFORE
- BEGIN
- BETWEEN
- BIGINT
- BINARY
- BITAND
- BITNOT
- BITOR
- BLOCKS
- BOOL
- BY
### C
- CACHE
- CACHELAST
- CASCADE
- CHANGE
- CLUSTER
- COLON
- COLUMN
- COMMA
- COMP
- COMPACT
- CONCAT
- CONFLICT
- CONNECTION
- CONNECTIONS
- CONNS
- COPY
- CREATE
- CTIME
### D
- DATABASE
- DATABASES
- DAYS
- DBS
- DEFERRED
- DELETE
- DELIMITERS
- DESC
- DESCRIBE
- DETACH
- DISTINCT
- DIVIDE
- DNODE
- DNODES
- DOT
- DOUBLE
- DROP
### E
- END
- EQ
- EXISTS
- EXPLAIN
### F
- FAIL
- FILE
- FILL
- FLOAT
- FOR
- FROM
- FSYNC
### G
- GE
- GLOB
- GRANTS
- GROUP
- GT
### H
- HAVING
### I
- ID
- IF
- IGNORE
- IMMEDIA
- IMPORT
- IN
- INITIAL
- INSERT
- INSTEAD
- INT
- INTEGER
- INTERVA
- INTO
- IS
- ISNULL
### J
- JOIN
### K
- KEEP
- KEY
- KILL
### L
- LE
- LIKE
- LIMIT
- LINEAR
- LOCAL
- LP
- LSHIFT
- LT
### M
- MATCH
- MAXROWS
- MINROWS
- MINUS
- MNODES
- MODIFY
- MODULES
### N
- NE
- NONE
- NOT
- NOTNULL
- NOW
- NULL
### O
- OF
- OFFSET
- OR
- ORDER
### P
- PARTITION
- PASS
- PLUS
- PPS
- PRECISION
- PREV
- PRIVILEGE
### Q
- QTIME
- QUERIE
- QUERY
- QUORUM
### R
- RAISE
- REM
- REPLACE
- REPLICA
- RESET
- RESTRIC
- ROW
- RP
- RSHIFT
### S
- SCORES
- SELECT
- SEMI
- SESSION
- SET
- SHOW
- SLASH
- SLIDING
- SLIMIT
- SMALLIN
- SOFFSET
- STable
- STableS
- STAR
- STATE
- STATEMEN
- STATE_WI
- STORAGE
- STREAM
- STREAMS
- STRING
- SYNCDB
### T
- TABLE
- TABLES
- TAG
- TAGS
- TBNAME
- TIMES
- TIMESTAMP
- TINYINT
- TOPIC
- TOPICS
- TRIGGER
- TSERIES
### U
- UMINUS
- UNION
- UNSIGNED
- UPDATE
- UPLUS
- USE
- USER
- USERS
- USING
### V
- VALUES
- VARIABLE
- VARIABLES
- VGROUPS
- VIEW
- VNODES
### W
- WAL
- WHERE
### _
- _C0
- _QSTART
- _QSTOP
- _QDURATION
- _WSTART
- _WSTOP
- _WDURATION
## 特殊说明
### TBNAME
`TBNAME` 可以视为超级表中一个特殊的标签，代表子表的表名。
获取一个超级表所有的子表名及相关的标签信息：
```mysql
SELECT TBNAME, location FROM meters;
```
统计超级表下辖子表数量：
```mysql
SELECT COUNT(TBNAME) FROM meters;
```
以上两个查询均只支持在WHERE条件子句中添加针对标签（TAGS）的过滤条件。例如：
```mysql
taos> SELECT TBNAME, location FROM meters;
tbname | location |
==================================================================
d1004 | California.SanFrancisco |
d1003 | California.SanFrancisco |
d1002 | California.LosAngeles |
d1001 | California.LosAngeles |
Query OK, 4 row(s) in set (0.000881s)
taos> SELECT COUNT(tbname) FROM meters WHERE groupId > 2;
count(tbname) |
========================
2 |
Query OK, 1 row(s) in set (0.001091s)
```
### _QSTART/_QSTOP/_QDURATION
表示查询过滤窗口的起始，结束以及持续时间 (从2.6.0.0版本开始支持)
### _WSTART/_WSTOP/_WDURATION
窗口切分聚合查询（例如 interval/session window/state window）中表示每个切分窗口的起始，结束以及持续时间（从 2.6.0.0 版本开始支持）
### _c0
表示表或超级表的第一列
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