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语法图 -**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) ## 示例 diff --git a/sql-statements/sql-statement-flashback-table.md b/sql-statements/sql-statement-flashback-table.md index cc9ab0a75ba3..968f8ce72428 100644 --- a/sql-statements/sql-statement-flashback-table.md +++ b/sql-statements/sql-statement-flashback-table.md @@ -24,6 +24,20 @@ aliases: ['/docs-cn/dev/reference/sql/statements/flashback-table/'] FLASHBACK TABLE table_name [TO other_table_name] ``` +### 语法图 + +**FlashbackTableStmt:** + +![FlashbackTableStmt](/media/sqlgram/FlashbackTableStmt.png) + +**TableName:** + +![TableName](/media/sqlgram/TableName.png) + +**FlashbackToNewName:** + +![FlashbackToNewName](/media/sqlgram/FlashbackToNewName.png) + ## 注意事项 如果删除了一张表并过了 GC lifetime，就不能再用 `FLASHBACK TABLE` 语句来恢复被删除的数据了，否则会返回错误，错误类似于 `Can't find dropped/truncated table 't' in GC safe point 2020-03-16 16:34:52 +0800 CST`。 diff --git a/sql-statements/sql-statement-recover-table.md b/sql-statements/sql-statement-recover-table.md index 080f1f91d751..e6246ae32b76 100644 --- a/sql-statements/sql-statement-recover-table.md +++ b/sql-statements/sql-statement-recover-table.md @@ -22,6 +22,24 @@ RECOVER TABLE table_name RECOVER TABLE BY JOB ddl_job_id ``` +### 语法图 + +**RecoverTableStmt:** + +![RecoverTableStmt](/media/sqlgram/RecoverTableStmt.png) + +**TableName:** + +![TableName](/media/sqlgram/TableName.png) + +**Int64Num:** + +![Int64Num](/media/sqlgram/Int64Num.png) + +**NUM:** + +![NUM](/media/sqlgram/NUM.png) + ## 注意事项 如果删除表后并过了 GC lifetime，就不能再用 `RECOVER TABLE` 来恢复被删除的表了，执行 `RECOVER TABLE` 语句会返回类似错误：`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 index 36cca7ed6a59..94b4f68612e3 100644 --- a/sql-statements/sql-statement-show-table-regions.md +++ b/sql-statements/sql-statement-show-table-regions.md @@ -9,7 +9,7 @@ aliases: ['/docs-cn/dev/reference/sql/statements/show-table-regions/'] `SHOW TABLE REGIONS` 语句用于显示 TiDB 中某个表的 Region 信息。 -## 语法图 +## 语法 ```sql SHOW TABLE [table_name] REGIONS [WhereClauseOptional]; @@ -17,6 +17,28 @@ SHOW TABLE [table_name] REGIONS [WhereClauseOptional]; SHOW TABLE [table_name] INDEX [index_name] REGIONS [WhereClauseOptional]; ``` +### 语法图 + +**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) + `SHOW TABLE REGIONS` 会返回如下列： * `REGION_ID`：Region 的 ID。 diff --git a/sql-statements/sql-statement-split-region.md b/sql-statements/sql-statement-split-region.md index 8dcfbd1ff346..ab33af7dd67c 100644 --- a/sql-statements/sql-statement-split-region.md +++ b/sql-statements/sql-statement-split-region.md @@ -12,6 +12,36 @@ aliases: ['/docs-cn/dev/reference/sql/statements/split-region/'] 为解决上述场景中的热点问题，TiDB 引入了预切分 Region 的功能，即可以根据指定的参数，预先为某个表切分出多个 Region，并打散到各个 TiKV 上去。 +## 语法图 + +**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) + ## Split Region 的使用 Split Region 有 2 种不同的语法，具体如下：