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docs: refine keywords section and add delete keywords

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docs/en/12-taos-sql/12-keywords.md
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...@@ -4,45 +4,312 @@ title: Keywords ...@@ -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. 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** ## Keywords List
| | | | | | ### A
| ----------- | ---------- | --------- | ---------- | ------------ |
| ABORT | CREATE | IGNORE | NULL | STAR | - ABORT
| ACCOUNT | CTIME | IMMEDIATE | OF | STATE | - ACCOUNT
| ACCOUNTS | DATABASE | IMPORT | OFFSET | STATEMENT | - ACCOUNTS
| ADD | DATABASES | IN | OR | STATE_WINDOW | - ADD
| AFTER | DAYS | INITIALLY | ORDER | STORAGE | - AFTER
| ALL | DBS | INSERT | PARTITIONS | STREAM | - ALL
| ALTER | DEFERRED | INSTEAD | PASS | STREAMS | - ALTER
| AND | DELIMITERS | INT | PLUS | STRING | - AND
| AS | DESC | INTEGER | PPS | SYNCDB | - AS
| ASC | DESCRIBE | INTERVAL | PRECISION | TABLE | - ASC
| ATTACH | DETACH | INTO | PREV | TABLES | - ATTACH
| BEFORE | DISTINCT | IS | PRIVILEGE | TAG |
| BEGIN | DIVIDE | ISNULL | QTIME | TAGS | ### B
| BETWEEN | DNODE | JOIN | QUERIES | TBNAME |
| BIGINT | DNODES | KEEP | QUERY | TIMES | - BEFORE
| BINARY | DOT | KEY | QUORUM | TIMESTAMP | - BEGIN
| BITAND | DOUBLE | KILL | RAISE | TINYINT | - BETWEEN
| BITNOT | DROP | LE | REM | TOPIC | - BIGINT
| BITOR | EACH | LIKE | REPLACE | TOPICS | - BINARY
| BLOCKS | END | LIMIT | REPLICA | TRIGGER | - BITAND
| BOOL | EQ | LINEAR | RESET | TSERIES | - BITNOT
| BY | EXISTS | LOCAL | RESTRICT | UMINUS | - BITOR
| CACHE | EXPLAIN | LP | ROW | UNION | - BLOCKS
| CACHELAST | FAIL | LSHIFT | RP | UNSIGNED | - BOOL
| CASCADE | FILE | LT | RSHIFT | UPDATE | - BY
| CHANGE | FILL | MATCH | SCORES | UPLUS |
| CLUSTER | FLOAT | MAXROWS | SELECT | USE | ### C
| COLON | FOR | MINROWS | SEMI | USER |
| COLUMN | FROM | MINUS | SESSION | USERS | - CACHE
| COMMA | FSYNC | MNODES | SET | USING | - CACHELAST
| COMP | GE | MODIFY | SHOW | VALUES | - CASCADE
| COMPACT | GLOB | MODULES | SLASH | VARIABLE | - CHANGE
| CONCAT | GRANTS | NCHAR | SLIDING | VARIABLES | - CLUSTER
| CONFLICT | GROUP | NE | SLIMIT | VGROUPS | - COLON
| CONNECTION | GT | NONE | SMALLINT | VIEW | - COLUMN
| CONNECTIONS | HAVING | NOT | SOFFSET | VNODES | - COMMA
| CONNS | ID | NOTNULL | STable | WAL | - COMP
| COPY | IF | NOW | STableS | WHERE | - 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 ...@@ -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： 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 | | | | | ### A
| ----------- | ---------- | --------- | ---------- | ------------ |
| ABORT | CREATE | IGNORE | NULL | STAR | - ABORT
| ACCOUNT | CTIME | IMMEDIATE | OF | STATE | - ACCOUNT
| ACCOUNTS | DATABASE | IMPORT | OFFSET | STATEMENT | - ACCOUNTS
| ADD | DATABASES | IN | OR | STATE_WINDOW | - ADD
| AFTER | DAYS | INITIALLY | ORDER | STORAGE | - AFTER
| ALL | DBS | INSERT | PARTITIONS | STREAM | - ALL
| ALTER | DEFERRED | INSTEAD | PASS | STREAMS | - ALTER
| AND | DELIMITERS | INT | PLUS | STRING | - AND
| AS | DESC | INTEGER | PPS | SYNCDB | - AS
| ASC | DESCRIBE | INTERVAL | PRECISION | TABLE | - ASC
| ATTACH | DETACH | INTO | PREV | TABLES | - ATTACH
| BEFORE | DISTINCT | IS | PRIVILEGE | TAG |
| BEGIN | DIVIDE | ISNULL | QTIME | TAGS | ### B
| BETWEEN | DNODE | JOIN | QUERIES | TBNAME |
| BIGINT | DNODES | KEEP | QUERY | TIMES | - BEFORE
| BINARY | DOT | KEY | QUORUM | TIMESTAMP | - BEGIN
| BITAND | DOUBLE | KILL | RAISE | TINYINT | - BETWEEN
| BITNOT | DROP | LE | REM | TOPIC | - BIGINT
| BITOR | EACH | LIKE | REPLACE | TOPICS | - BINARY
| BLOCKS | END | LIMIT | REPLICA | TRIGGER | - BITAND
| BOOL | EQ | LINEAR | RESET | TSERIES | - BITNOT
| BY | EXISTS | LOCAL | RESTRICT | UMINUS | - BITOR
| CACHE | EXPLAIN | LP | ROW | UNION | - BLOCKS
| CACHELAST | FAIL | LSHIFT | RP | UNSIGNED | - BOOL
| CASCADE | FILE | LT | RSHIFT | UPDATE | - BY
| CHANGE | FILL | MATCH | SCORES | UPLUS |
| CLUSTER | FLOAT | MAXROWS | SELECT | USE | ### C
| COLON | FOR | MINROWS | SEMI | USER |
| COLUMN | FROM | MINUS | SESSION | USERS | - CACHE
| COMMA | FSYNC | MNODES | SET | USING | - CACHELAST
| COMP | GE | MODIFY | SHOW | VALUES | - CASCADE
| COMPACT | GLOB | MODULES | SLASH | VARIABLE | - CHANGE
| CONCAT | GRANTS | NCHAR | SLIDING | VARIABLES | - CLUSTER
| CONFLICT | GROUP | NE | SLIMIT | VGROUPS | - COLON
| CONNECTION | GT | NONE | SMALLINT | VIEW | - COLUMN
| CONNECTIONS | HAVING | NOT | SOFFSET | VNODES | - COMMA
| CONNS | ID | NOTNULL | STABLE | WAL | - COMP
| COPY | IF | NOW | STABLES | WHERE | - 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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