在“Owner”表中添加“Total”字段,计算并存储该Owner的总消费金额。
时间: 2023-09-10 14:05:06 浏览: 45
好的,您需要在“Owner”表中添加一个名为“Total”的字段,数据类型为数值类型,用于存储该Owner的总消费金额。然后,您需要编写一个SQL查询语句,用于计算每个Owner的总消费金额,并将结果更新到“Total”字段中。以下是一个示例查询语句:
```
UPDATE Owner
SET Total = (
SELECT SUM(Price)
FROM Purchase
WHERE Purchase.OwnerID = Owner.ID
)
```
上述查询语句将更新“Owner”表中所有记录的“Total”字段,以匹配与每个Owner相关联的所有“Purchase”记录的总消费金额。请注意,上述查询语句假定存在一个名为“Purchase”的表,该表包含有关每个购买事务的信息,并具有一个名为“OwnerID”的字段,该字段用于标识购买所属的Owner。如果您的数据模型不同,请相应地调整查询语句。
相关问题
Orcle中在“Owner”表中添加“Total”字段,计算并存储该Owner的总消费金额。
好的,针对Oracle数据库,可以使用以下SQL语句来实现在“Owner”表中添加“Total”字段,计算并存储该Owner的总消费金额:
```
ALTER TABLE Owner ADD Total NUMBER(10,2);
UPDATE Owner
SET Total = (
SELECT SUM(Amount)
FROM Purchase
WHERE OwnerId = Owner.Id
);
```
这个SQL语句首先在“Owner”表中新增一个“Total”字段,数据类型为NUMBER(10,2),即最多10位数字,其中2位为小数。然后使用一个子查询来计算每个Owner的总消费金额,并将结果更新到“Owner”表中的“Total”字段中。注意,这里的SQL语句假设有一个名为“Purchase”的表,其中包含“OwnerId”和“Amount”字段,用于存储每个Owner的购买记录。如果您的表结构不同,请相应地修改SQL语句。
使用bat从{"media_type":2,"has_dash_audio":true,"is_completed":true,"total_bytes":54528541,"downloaded_bytes":54528541,"title":"【稚雨】宇宙 ૮ ´͈ ᗜ ͈ ა♡|ユニバース","type_tag":"112","cover":"http:\/\/i0.hdslb.com\/bfs\/archive\/aacd3a3a3397a4ca7426ff9ac237d57bd5ea5b6d.jpg","video_quality":112,"prefered_video_quality":112,"guessed_total_bytes":0,"total_time_milli":252543,"danmaku_count":33,"time_update_stamp":1689402493484,"time_create_stamp":1689402474935,"can_play_in_advance":true,"interrupt_transform_temp_file":false,"quality_pithy_description":"1080P","quality_superscript":"高码率","cache_version_code":7370300,"preferred_audio_quality":0,"audio_quality":0,"avid":870875619,"spid":0,"seasion_id":0,"bvid":"BV15V4y1b7Xv","owner_id":344270893,"owner_name":"稚雨才不是至于","owner_avatar":"https:\/\/i1.hdslb.com\/bfs\/face\/a3175ec8b252285ff802beedd8fe099016b90ea5.jpg","page_data":{"cid":1196836330,"page":1,"from":"vupload","part":"宇宙","link":"","vid":"","has_alias":false,"tid":20,"width":1920,"height":1080,"rotate":0,"download_title":"视频已缓存完成","download_subtitle":"【稚雨】宇宙 ૮ ´͈ ᗜ ͈ ა♡|ユニバース 宇宙"}}之中提取title字段的值
你可以使用 Batch 脚本中的字符串操作来提取 JSON 数据中的 `title` 字段的值。下面是一个示例脚本:
```batch
@echo off
setlocal enabledelayedexpansion
set "json={"media_type":2,"has_dash_audio":true,"is_completed":true,"total_bytes":54528541,"downloaded_bytes":54528541,"title":"【稚雨】宇宙 ૮ ´͈ ᗜ ͈ ა♡|ユニバース","type_tag":"112","cover":"http:\/\/i0.hdslb.com\/bfs\/archive\/aacd3a3a3397a4ca7426ff9ac237d57bd5ea5b6d.jpg","video_quality":112,"prefered_video_quality":112,"guessed_total_bytes":0,"total_time_milli":252543,"danmaku_count":33,"time_update_stamp":1689402493484,"time_create_stamp":1689402474935,"can_play_in_advance":true,"interrupt_transform_temp_file":false,"quality_pithy_description":"1080P","quality_superscript":"高码率","cache_version_code":7370300,"preferred_audio_quality":0,"audio_quality":0,"avid":870875619,"spid":0,"seasion_id":0,"bvid":"BV15V4y1b7Xv","owner_id":344270893,"owner_name":"稚雨才不是至于","owner_avatar":"https:\/\/i1.hdslb.com\/bfs\/face\/a3175ec8b252285ff802beedd8fe099016b90ea5.jpg","page_data":{"cid":1196836330,"page":1,"from":"vupload","part":"宇宙","link":"","vid":"","has_alias":false,"tid":20,"width":1920,"height":1080,"rotate":0,"download_title":"视频已缓存完成","download_subtitle":"【稚雨】宇宙 ૮ ´͈ ᗜ ͈ ა♡|ユニバース 宇宙"}}"
set "title=!json:*\"title\":\"=!"
set "title=!title:\"*=!"
echo %title%
```
在上述脚本中,我将 JSON 数据存储在 `json` 变量中。然后使用字符串操作来提取 `title` 字段的值。
首先,使用 `set "title=!json:*\"title\":\"=!"` 将 `title` 变量设置为从 JSON 数据中删除 `title":"` 后的内容。
然后,使用 `set "title=!title:\"*=!"` 去除 `title` 变量末尾的双引号,得到最终的标题值。
请注意,脚本中的字符串操作可能需要根据你的实际情况进行修改。