update some syntax diagram (#2830)

Signed-off-by: crazycs520 <[email protected]>
pingcap · Jun 15, 2020 · 18bc266 · 18bc266
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diff --git a/sql-statements/sql-statement-drop-index.md b/sql-statements/sql-statement-drop-index.md
@@ -11,21 +11,29 @@ This statement removes an index from a specified table, marking space as free in
 
 ## Synopsis
 
-**AlterTableStmt:**
+**AlterTableDropIndexStmt:**
 
-![AlterTableStmt](/media/sqlgram/AlterTableStmt.png)
+![AlterTableDropIndexStmt](/media/sqlgram/AlterTableDropIndexStmt.png)
 
-**AlterTableSpec:**
+**IgnoreOptional:**
 
-![AlterTableSpec](/media/sqlgram/AlterTableSpec.png)
+![IgnoreOptional](/media/sqlgram/IgnoreOptional.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+**AlterTableDropIndexSpec:**
+
+![AlterTableDropIndexSpec](/media/sqlgram/AlterTableDropIndexSpec.png)
 
 **KeyOrIndex:**
 
 ![KeyOrIndex](/media/sqlgram/KeyOrIndex.png)
 
-**Identifier:**
+**IfExists:**
 
-![Identifier](/media/sqlgram/Identifier.png)
+![IfExists](/media/sqlgram/IfExists.png)
 
 ## Examples
 

diff --git a/sql-statements/sql-statement-flashback-table.md b/sql-statements/sql-statement-flashback-table.md
@@ -25,6 +25,20 @@ select * from mysql.tidb where variable_name in ('tikv_gc_safe_point','tikv_gc_l
 FLASHBACK TABLE table_name [TO other_table_name]
 ```
 
+## Synopsis
+
+**FlashbackTableStmt:**
+
+![FlashbackTableStmt](/media/sqlgram/FlashbackTableStmt.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+**FlashbackToNewName:**
+
+![FlashbackToNewName](/media/sqlgram/FlashbackToNewName.png)
+
 ## Notes
 
 If a table is dropped and the GC lifetime has passed, you can no longer use the `FLASHBACK TABLE` statement to recover the dropped data. Otherwise, an error like `Can't find dropped / truncated table 't' in GC safe point 2020-03-16 16:34:52 +0800 CST` will be returned.

diff --git a/sql-statements/sql-statement-recover-table.md b/sql-statements/sql-statement-recover-table.md
@@ -23,6 +23,24 @@ RECOVER TABLE table_name
 RECOVER TABLE BY JOB ddl_job_id
 ```
 
+## Synopsis
+
+**RecoverTableStmt:**
+
+![RecoverTableStmt](/media/sqlgram/RecoverTableStmt.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+**Int64Num:**
+
+![Int64Num](/media/sqlgram/Int64Num.png)
+
+**NUM:**
+
+![NUM](/media/sqlgram/NUM.png)
+
 > **Note:**
 >
 > + If a table is deleted and the GC lifetime is out, the table cannot be recovered with `RECOVER TABLE`. Execution of `RECOVER TABLE` in this scenario returns an error like: `snapshot is older than GC safe point 2019-07-10 13:45:57 +0800 CST`.

diff --git a/sql-statements/sql-statement-show-table-regions.md b/sql-statements/sql-statement-show-table-regions.md
@@ -9,13 +9,35 @@ aliases: ['/docs/dev/reference/sql/statements/show-table-regions/']
 
 The `SHOW TABLE REGIONS` statement is used to show the Region information of a table in TiDB.
 
-## Synopsis
+## Syntax
 
 ```sql
 SHOW TABLE [table_name] REGIONS [WhereClauseOptional];
 SHOW TABLE [table_name] INDEX [index_name] REGIONS [WhereClauseOptional];
 ```
 
+## Synopsis
+
+**ShowTableRegionStmt:**
+
+![ShowTableRegionStmt](/media/sqlgram/ShowTableRegionStmt.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+**PartitionNameListOpt:**
+
+![PartitionNameListOpt](/media/sqlgram/PartitionNameListOpt.png)
+
+**WhereClauseOptional:**
+
+![WhereClauseOptional](/media/sqlgram/WhereClauseOptional.png)
+
+**WhereClause:**
+
+![WhereClause](/media/sqlgram/WhereClause.png)
+
 Executing `SHOW TABLE REGIONS` returns the following columns:
 
 * `REGION_ID`: The Region ID.

diff --git a/sql-statements/sql-statement-split-region.md b/sql-statements/sql-statement-split-region.md
@@ -13,6 +13,36 @@ In the above case, because there is only one Region at the beginning, all write
 
 To solve the hotspot problem in the above scenario, TiDB introduces the pre-split function, which can pre-split multiple Regions for a certain table according to the specified parameters and scatter them to each TiKV node.
 
+## Synopsis
+
+**SplitRegionStmt:**
+
+![SplitRegionStmt](/media/sqlgram/SplitRegionStmt.png)
+
+**SplitSyntaxOption:**
+
+![SplitSyntaxOption](/media/sqlgram/SplitSyntaxOption.png)
+
+**TableName:**
+
+![TableName](/media/sqlgram/TableName.png)
+
+**PartitionNameListOpt:**
+
+![PartitionNameListOpt](/media/sqlgram/PartitionNameListOpt.png)
+
+**SplitOption:**
+
+![SplitOption](/media/sqlgram/SplitOption.png)
+
+**RowValue:**
+
+![RowValue](/media/sqlgram/RowValue.png)
+
+**Int64Num:**
+
+![Int64Num](/media/sqlgram/Int64Num.png)
+
 ## Usage of Split Region
 
 There are two types of Split Region syntax: