从补丁 198 开始，Amazon Redshift 将不再支持创建新的 Python UDF。现有的 Python UDF 将继续正常运行至 2026 年 6 月 30 日。有关更多信息，请参阅[博客文章](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/)。
# STL\$1DELETE
分析查询的删除执行步骤。
STL\$1DELETE 对所有用户可见。超级用户可以查看所有行；普通用户只能查看其自己的数据。有关更多信息，请参阅 [系统表和视图中的数据可见性](cm_chap_system-tables.md#c_visibility-of-data)。
**注意**
STL\$1DELETE 仅包含在主预置集群上运行的查询。它不包含在并发扩展集群或无服务器命名空间上运行的查询。要访问在主集群、并发扩展集群和无服务器命名空间上运行的查询的解释计划，我们建议您使用 SYS 监控视图 [SYS\$1QUERY\$1DETAIL](SYS_QUERY_DETAIL.md)。SYS 监控视图中的数据经过格式化处理，便于使用和理解。
## 表列
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/zh_cn/redshift/latest/dg/r_STL_DELETE.html)
## 示例查询
为了在 STL\$1DELETE 中创建行，以下示例将一行插入到 EVENT 表中，然后删除该行。
首先，将一行插入到 EVENT 表中并确认已插入该行。
```
insert into event(eventid,venueid,catid,dateid,eventname)
values ((select max(eventid)+1 from event),95,9,1857,'Lollapalooza');
```
```
select * from event
where eventname='Lollapalooza'
order by eventid;
```
```
eventid | venueid | catid | dateid | eventname | starttime
---------+---------+-------+--------+--------------+---------------------
4274 | 102 | 9 | 1965 | Lollapalooza | 2008-05-01 19:00:00
4684 | 114 | 9 | 2105 | Lollapalooza | 2008-10-06 14:00:00
5673 | 128 | 9 | 1973 | Lollapalooza | 2008-05-01 15:00:00
5740 | 51 | 9 | 1933 | Lollapalooza | 2008-04-17 15:00:00
5856 | 119 | 9 | 1831 | Lollapalooza | 2008-01-05 14:00:00
6040 | 126 | 9 | 2145 | Lollapalooza | 2008-11-15 15:00:00
7972 | 92 | 9 | 2026 | Lollapalooza | 2008-07-19 19:30:00
8046 | 65 | 9 | 1840 | Lollapalooza | 2008-01-14 15:00:00
8518 | 48 | 9 | 1904 | Lollapalooza | 2008-03-19 15:00:00
8799 | 95 | 9 | 1857 | Lollapalooza |
(10 rows)
```
现在，删除您添加到 EVENT 表中的行并确认已删除该行。
```
delete from event
where eventname='Lollapalooza' and eventid=(select max(eventid) from event);
```
```
select * from event
where eventname='Lollapalooza'
order by eventid;
```
```
eventid | venueid | catid | dateid | eventname | starttime
---------+---------+-------+--------+--------------+---------------------
4274 | 102 | 9 | 1965 | Lollapalooza | 2008-05-01 19:00:00
4684 | 114 | 9 | 2105 | Lollapalooza | 2008-10-06 14:00:00
5673 | 128 | 9 | 1973 | Lollapalooza | 2008-05-01 15:00:00
5740 | 51 | 9 | 1933 | Lollapalooza | 2008-04-17 15:00:00
5856 | 119 | 9 | 1831 | Lollapalooza | 2008-01-05 14:00:00
6040 | 126 | 9 | 2145 | Lollapalooza | 2008-11-15 15:00:00
7972 | 92 | 9 | 2026 | Lollapalooza | 2008-07-19 19:30:00
8046 | 65 | 9 | 1840 | Lollapalooza | 2008-01-14 15:00:00
8518 | 48 | 9 | 1904 | Lollapalooza | 2008-03-19 15:00:00
(9 rows)
```
然后，查询 stl\$1delete 以查看删除的执行步骤。在本示例中，查询返回 300 多行，因此已缩短下面的输出以便于显示。
```
select query, slice, segment, step, tasknum, rows, tbl from stl_delete order by query;
```
```
query | slice | segment | step | tasknum | rows | tbl
-------+-------+---------+------+---------+------+--------
7 | 0 | 0 | 1 | 0 | 0 | 100000
7 | 1 | 0 | 1 | 0 | 0 | 100000
8 | 0 | 0 | 1 | 2 | 0 | 100001
8 | 1 | 0 | 1 | 2 | 0 | 100001
9 | 0 | 0 | 1 | 4 | 0 | 100002
9 | 1 | 0 | 1 | 4 | 0 | 100002
10 | 0 | 0 | 1 | 6 | 0 | 100003
10 | 1 | 0 | 1 | 6 | 0 | 100003
11 | 0 | 0 | 1 | 8 | 0 | 100253
11 | 1 | 0 | 1 | 8 | 0 | 100253
12 | 0 | 0 | 1 | 0 | 0 | 100255
12 | 1 | 0 | 1 | 0 | 0 | 100255
13 | 0 | 0 | 1 | 2 | 0 | 100257
13 | 1 | 0 | 1 | 2 | 0 | 100257
14 | 0 | 0 | 1 | 4 | 0 | 100259
14 | 1 | 0 | 1 | 4 | 0 | 100259
...
```