Add docs for the I_S keyword table

TOC-tidb-cloud.md

@@ -543,6 +543,7 @@
         - [`DDL_JOBS`](/information-schema/information-schema-ddl-jobs.md)
         - [`DEADLOCKS`](/information-schema/information-schema-deadlocks.md)
         - [`ENGINES`](/information-schema/information-schema-engines.md)
+        - [`KEYWORDS`](/information-schema/information-schema-keywords.md)
         - [`KEY_COLUMN_USAGE`](/information-schema/information-schema-key-column-usage.md)
         - [`MEMORY_USAGE`](/information-schema/information-schema-memory-usage.md)
         - [`MEMORY_USAGE_OPS_HISTORY`](/information-schema/information-schema-memory-usage-ops-history.md)

TOC.md

@@ -927,6 +927,7 @@
         - [`INSPECTION_RESULT`](/information-schema/information-schema-inspection-result.md)
         - [`INSPECTION_RULES`](/information-schema/information-schema-inspection-rules.md)
         - [`INSPECTION_SUMMARY`](/information-schema/information-schema-inspection-summary.md)
+        - [`KEYWORDS`](/information-schema/information-schema-keywords.md)
         - [`KEY_COLUMN_USAGE`](/information-schema/information-schema-key-column-usage.md)
         - [`MEMORY_USAGE`](/information-schema/information-schema-memory-usage.md)
         - [`MEMORY_USAGE_OPS_HISTORY`](/information-schema/information-schema-memory-usage-ops-history.md)

information-schema/information-schema-keywords.md

@@ -0,0 +1,48 @@
+---
+title: KEYWORDS
+summary: Learn the `KEYWORDS` INFORMATION_SCHEMA table.
+---
+
+# KEYWORDS
+
+Starting from v7.6.0, TiDB provides the `KEYWORDS` table. You can use this table to get information about [keywords](/keywords.md) in TiDB.
+
+```sql
+USE INFORMATION_SCHEMA;
+DESC keywords;
+```
+
+The output is as follows:
+
+```
++----------+--------------+------+------+---------+-------+
+| Field    | Type         | Null | Key  | Default | Extra |
++----------+--------------+------+------+---------+-------+
+| WORD     | varchar(128) | YES  |      | NULL    |       |
+| RESERVED | int(11)      | YES  |      | NULL    |       |
++----------+--------------+------+------+---------+-------+
+2 rows in set (0.00 sec)
+```
+
+Field description:
+
+- `WORD`: The keyword.
+- `RESERVED`: Whether the keyword is reserved.
+
+The following statement queries the information about `ADD` and `USER` keywords:
+
+```sql
+SELECT * FROM INFORMATION_SCHEMA.KEYWORDS WHERE WORD IN ('ADD','USER');
+```
+
+From the output, you can see that `ADD` is a reserved keyword and `USER` is a non-reserved keyword.
+
+```
++------+----------+
+| WORD | RESERVED |
++------+----------+
+| ADD  |        1 |
+| USER |        0 |
++------+----------+
+2 rows in set (0.00 sec)
+```

information-schema/information-schema.md

@@ -28,6 +28,7 @@ Many `INFORMATION_SCHEMA` tables have a corresponding `SHOW` command. The benefi
 | `FILES`                                                                                 | Not implemented by TiDB. Returns zero rows. |
 | `GLOBAL_STATUS`                                                                         | Not implemented by TiDB. Returns zero rows. |
 | `GLOBAL_VARIABLES`                                                                      | Not implemented by TiDB. Returns zero rows. |
+| [`KEYWORDS`](/information-schema/information-schema-keywords.md)                        | Provides a full list of keywords.                |
 | [`KEY_COLUMN_USAGE`](/information-schema/information-schema-key-column-usage.md)        | Describes the key constraints of the columns, such as the primary key constraint. |
 | `OPTIMIZER_TRACE`                                                                       | Not implemented by TiDB. Returns zero rows. |
 | `PARAMETERS`                                                                            | Not implemented by TiDB. Returns zero rows. |

keywords.md

@@ -56,6 +56,8 @@ CREATE TABLE test.select (BEGIN int, END int);
 Query OK, 0 rows affected (0.08 sec)
 ```
 
+Starting from v7.6.0, TiDB provides a full list of keywords in the [`INFORMATION_SCHEMA.KEYWORDS`](/information-schema/information-schema-keywords.md) table.
+
 ## Keyword list
 
 The following list shows the keywords in TiDB. Reserved keywords are marked with `(R)`. Reserved keywords for [Window Functions](/functions-and-operators/window-functions.md) are marked with `(R-Window)`. Special non-reserved keywords that need to be escaped with backticks `` ` `` are marked with `(S)`.