From 253246469764b85629c798ddb1c6118263e03dd0 Mon Sep 17 00:00:00 2001
From: wade zhang <95411902+gccgdb1234@users.noreply.github.com>
Date: Mon, 9 Jan 2023 14:08:03 +0800
Subject: [PATCH] Update 29-changes.md
---
docs/en/12-taos-sql/29-changes.md | 2 --
1 file changed, 2 deletions(-)
diff --git a/docs/en/12-taos-sql/29-changes.md b/docs/en/12-taos-sql/29-changes.md
index 78b6d5fc05..89247f913b 100644
--- a/docs/en/12-taos-sql/29-changes.md
+++ b/docs/en/12-taos-sql/29-changes.md
@@ -54,7 +54,6 @@ The following data types can be used in the schema for standard tables.
| 27 | GRANT | Added | Grants permissions to a user.
| 28 | KILL TRANSACTION | Added | Terminates an mnode transaction.
| 29 | KILL STREAM | Deprecated | Terminated a continuous query. The continuous query feature has been replaced with the stream processing feature.
-| 30 | MERGE VGROUP | Added | Merges vgroups.
| 31 | REVOKE | Added | Revokes permissions from a user.
| 32 | SELECT | Modified |
- SELECT does not use the implicit results column. Output columns must be specified in the SELECT clause.
- DISTINCT support is enhanced. In previous versions, DISTINCT only worked on the tag column and could not be used with JOIN or GROUP BY.
- JOIN support is enhanced. The following are now supported after JOIN: a WHERE clause with OR, operations on multiple tables, and GROUP BY on multiple tables.
- Subqueries after FROM are enhanced. Levels of nesting are no longer restricted. Subqueries can be used with UNION ALL. Other syntax restrictions are eliminated.
- All scalar functions can be used after WHERE.
- GROUP BY is enhanced. You can group by any scalar expression or combination thereof.
- SESSION can be used on supertables. When PARTITION BY is not used, data in supertables is merged into a single timeline.
- STATE_WINDOW can be used on supertables. When PARTITION BY is not used, data in supertables is merged into a single timeline.
- ORDER BY is enhanced. It is no longer required to use ORDER BY and GROUP BY together. There is no longer a restriction on the number of order expressions. NULLS FIRST and NULLS LAST syntax has been added. Any expression that conforms to the ORDER BY semantics can be used.
- Added PARTITION BY syntax. PARTITION BY replaces GROUP BY tags.
| 33 | SHOW ACCOUNTS | Deprecated | This Enterprise Edition-only statement has been removed. It returns the error "This statement is no longer supported."
@@ -76,7 +75,6 @@ The following data types can be used in the schema for standard tables.
| 49 | SHOW TRANSACTIONS | Added | Shows all running transactions in the system.
| 50 | SHOW DNODE VARIABLES | Added | Shows the configuration of the specified dnode.
| 51 | SHOW VNODES | Not supported | Shows information about vnodes in the system. Not supported.
-| 52 | SPLIT VGROUP | Added | Splits a vgroup into two vgroups.
| 53 | TRIM DATABASE | Added | Deletes data that has expired and orders the remaining data in accordance with the storage configuration.
## SQL Functions