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Translate zh/sql-reference/statements/alter/order-by: translate to zh

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cnmade 2022-02-18 16:50:19 +08:00
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docs/zh/sql-reference/statements/alter/order-by.md
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@ -3,15 +3,15 @@ toc_priority: 41
toc_title: ORDER BY
---
# Manipulating Key Expressions {#manipulations-with-key-expressions}
# 操作排序键表达式 {#manipulations-with-key-expressions}
``` sql
ALTER TABLE [db].name [ON CLUSTER cluster] MODIFY ORDER BY new_expression
```
该命令将表的[排序键](../../../engines/table-engines/mergetree-family/mergetree.md)更改为 `new_expression`(表达式或表达式元组)。主键保持不变。
The command changes the [sorting key](../../../engines/table-engines/mergetree-family/mergetree.md) of the table to `new_expression` (an expression or a tuple of expressions). Primary key remains the same.
从某种意义上说，该命令是轻量级的，它只更改元数据。要保持数据部分行按排序键表达式排序的属性，您不能向排序键添加包含现有列的表达式(仅在相同的`ALTER`查询中由`ADD COLUMN`命令添加的列，没有默认的列值)。
The command is lightweight in a sense that it only changes metadata. To keep the property that data part rows are ordered by the sorting key expression you cannot add expressions containing existing columns to the sorting key (only columns added by the `ADD COLUMN` command in the same `ALTER` query, without default column value).
!!! note "Note"
It only works for tables in the [`MergeTree`](../../../engines/table-engines/mergetree-family/mergetree.md) family (including [replicated](../../../engines/table-engines/mergetree-family/replication.md) tables).
!!! note "备注"
它只适用于[`MergeTree`](../../../engines/table-engines/mergetree-family/mergetree.md)表族(包括[replicated](../../../engines/table-engines/mergetree-family/replication.md)表)。