实时数仓 Hologres null 的相关内容

hologres 对一个已有数据的表增加字段的时候，是不是无法使其 NOT NULL 啊？

dataworks创建hologres相关任务时提示数据源null不存在？

实时数仓Hologres 干货20讲

20 课时 |

405 人已学 |

加入学习

实时数仓 Hologres 实战课程

5 课时 |

223 人已学 |

加入学习

实时数仓入门课程

7 课时 |

1889 人已学 |

加入学习

DataWorks从Kafka同步数据到Hologres中，希望将null赋值为空串。

Hologres里面字段的value为null的话，是否不占用存储空间

共有4条

< 1 >

跳转至： GO

更新时间 2024-02-07 18:00:08

本页面内关键词为智能算法引擎基于机器学习所生成，如有任何问题，可在页面下方点击"联系我们"与我们沟通。

产品推荐

{"optioninfo":{"dynamic":"ture","static":"true"},"simplifiedDisplay":"newEdition","newCard":[{"ifIcon":"img","link":"https://img.alicdn.com/tfs/TB1XY8hGYr1gK0jSZFDXXb9yVXa-1740-328.png","icon":"","iconImg":"https://img.alicdn.com/tfs/TB1zEY.qQ9l0K4jSZFKXXXFjpXa-200-200.png","contentLink":"https://www.aliyun.com/product/bigdata/hologram","title":" 实时数仓Hologres(原交互式分析)","des":"Hologres基于创新的HSAP架构，将您原先数仓架构中的OLAP系统（Greenplum/Presto/Impala/ClickHouse）、KV数据库/Serving系统（HBase/Redis）统一在一个大数据计算引擎中，并提供快速的离线实时一体化分析能力。","link1":"https://www.aliyun.com/product/bigdata/hologram","btn1":"产品详情","link2":"https://free.aliyun.com/?crowd=personal&pipCode=hologram","btn2":"免费试用5000CU时","btn3":"产品文档","link3":"https://help.aliyun.com/product/113622.html?spm=5176.19600405.J_5253785160.5.54ab77c13TZCq7","infoGroup":[{"infoName":"优惠活动","infoContent":{"firstContentName":"首购首月888元","firstContentLink":"https://common-buy.aliyun.com/?spm=5176.19600405.J_5253785160.2.54ab77c13TZCq7&commodityCode=hologram_combo_public_cn","lastContentLink":"https://common-buy.aliyun.com/package?spm=5176.19600405.J_5253785160.7.54ab77c13TZCq7&planCode=package_HGQBI_cn&accounttraceid=8645eef606d74c0b8238a9f0c54e348ccqwu","lastContentName":"组合套餐推荐"}},{"infoName":"产品入门","infoContent":{"firstContentName":" HoloWeb快速入门","lastContentName":"Hologres快速上手","firstContentLink":"https://help.aliyun.com/document_detail/170507.html?spm=5176.19600405.J_2964307260.5.54ab77c13TZCq7","lastContentLink":"https://help.aliyun.com/document_detail/113648.html?spm=5176.19600405.J_2964307260.2.54ab77c13TZCq7"}},{"infoName":"最佳实践","infoContent":{"firstContentLink":"https://help.aliyun.com/document_detail/162594.html?spm=a2c4g.11174283.6.744.7d54729fBVxVd8","firstContentName":"性能调优","lastContentName":"数仓搭建","lastContentLink":"https://help.aliyun.com/document_detail/163258.html?spm=a2c4g.11174283.6.748.7d54729fBVxVd8"}},{"infoName":"最新动态","infoContent":{"firstContentLink":"https://www.aliyun.com/product/new?category=217&product=453","firstContentName":"产品最新动态","lastContentLink":"","lastContentName":""}}]}],"card":[],"search":[],"infoCard":[{"bannerUrl":"https://img.alicdn.com/tfs/TB1Xf81a3gP7K4jSZFqXXamhVXa-5169-974.jpg","bannerTitle":"mPaaS 小程序","bannerContent":"源自于支付宝小程序框架，亿级线上业务体量的锤炼，安全性媲美支付宝原生能力。<br>不仅面向自有 App 投放小程序，更可快速构建打包，覆盖支付宝、淘宝、钉钉等应用。","liveButtonName":"查看详情","liveButtonLink":"https://www.aliyun.com/product/mobilepaas/mpaas-miniprogram","contentTitle":"提供即开即用的端上体验","homePageLink":"https://common-buy.aliyun.com/?spm=5176.14673561.J_8751524360.2.56702709BussF3&commodityCode=mpaas_beta#/open","homePageName":"免费试用","linkGroup":[{"linkContent":"发布包大小极致优化，节省流量和存储。"},{"linkContent":"服务迭代不再受发版限制，快速发布，快速迭代。"},{"linkContent":"业务开发效率更加优秀，一次开发，多端运行。"}]}],"title":{"mainTitle":"mPaaS","subtitle":"源自于支付宝小程序框架，亿级线上业务体量的锤炼，安全性媲美支付宝原生能力。不仅面向自有 App 投放小程序，更可快速构建打包，覆盖支付宝、淘宝、钉钉等应用。","linkUrl":"https://www.aliyun.com/product/mobilepaas/mpaas-miniprogram","btnText":"查看详情"},"visual":{"topbg":"https://img.alicdn.com/tfs/TB1bQuBIYH1gK0jSZFwXXc7aXXa-3840-740.gif","icon":"","textColor":"dark"},"dataList":[{"summary":"啦啦啦","author":"wuwu","linksUrl":"#"}],"sceneCard":[],"txt":[]}

{"$env":{"JSON":{}},"$page":{"env":"production"},"$context":{"optioninfo":{"dynamic":"ture","static":"true"},"simplifiedDisplay":"newEdition","newCard":[{"ifIcon":"img","link":"https://img.alicdn.com/tfs/TB1XY8hGYr1gK0jSZFDXXb9yVXa-1740-328.png","icon":"","iconImg":"https://img.alicdn.com/tfs/TB1zEY.qQ9l0K4jSZFKXXXFjpXa-200-200.png","contentLink":"https://www.aliyun.com/product/bigdata/hologram","title":" 实时数仓Hologres(原交互式分析)","des":"Hologres基于创新的HSAP架构，将您原先数仓架构中的OLAP系统（Greenplum/Presto/Impala/ClickHouse）、KV数据库/Serving系统（HBase/Redis）统一在一个大数据计算引擎中，并提供快速的离线实时一体化分析能力。","link1":"https://www.aliyun.com/product/bigdata/hologram","btn1":"产品详情","link2":"https://free.aliyun.com/?crowd=personal&pipCode=hologram","btn2":"免费试用5000CU时","btn3":"产品文档","link3":"https://help.aliyun.com/product/113622.html?spm=5176.19600405.J_5253785160.5.54ab77c13TZCq7","infoGroup":[{"infoName":"优惠活动","infoContent":{"firstContentName":"首购首月888元","firstContentLink":"https://common-buy.aliyun.com/?spm=5176.19600405.J_5253785160.2.54ab77c13TZCq7&commodityCode=hologram_combo_public_cn","lastContentLink":"https://common-buy.aliyun.com/package?spm=5176.19600405.J_5253785160.7.54ab77c13TZCq7&planCode=package_HGQBI_cn&accounttraceid=8645eef606d74c0b8238a9f0c54e348ccqwu","lastContentName":"组合套餐推荐"}},{"infoName":"产品入门","infoContent":{"firstContentName":" HoloWeb快速入门","lastContentName":"Hologres快速上手","firstContentLink":"https://help.aliyun.com/document_detail/170507.html?spm=5176.19600405.J_2964307260.5.54ab77c13TZCq7","lastContentLink":"https://help.aliyun.com/document_detail/113648.html?spm=5176.19600405.J_2964307260.2.54ab77c13TZCq7"}},{"infoName":"最佳实践","infoContent":{"firstContentLink":"https://help.aliyun.com/document_detail/162594.html?spm=a2c4g.11174283.6.744.7d54729fBVxVd8","firstContentName":"性能调优","lastContentName":"数仓搭建","lastContentLink":"https://help.aliyun.com/document_detail/163258.html?spm=a2c4g.11174283.6.748.7d54729fBVxVd8"}},{"infoName":"最新动态","infoContent":{"firstContentLink":"https://www.aliyun.com/product/new?category=217&product=453","firstContentName":"产品最新动态","lastContentLink":"","lastContentName":""}}]}],"card":[],"search":[],"infoCard":[{"bannerUrl":"https://img.alicdn.com/tfs/TB1Xf81a3gP7K4jSZFqXXamhVXa-5169-974.jpg","bannerTitle":"mPaaS 小程序","bannerContent":"源自于支付宝小程序框架，亿级线上业务体量的锤炼，安全性媲美支付宝原生能力。<br>不仅面向自有 App 投放小程序，更可快速构建打包，覆盖支付宝、淘宝、钉钉等应用。","liveButtonName":"查看详情","liveButtonLink":"https://www.aliyun.com/product/mobilepaas/mpaas-miniprogram","contentTitle":"提供即开即用的端上体验","homePageLink":"https://common-buy.aliyun.com/?spm=5176.14673561.J_8751524360.2.56702709BussF3&commodityCode=mpaas_beta#/open","homePageName":"免费试用","linkGroup":[{"linkContent":"发布包大小极致优化，节省流量和存储。"},{"linkContent":"服务迭代不再受发版限制，快速发布，快速迭代。"},{"linkContent":"业务开发效率更加优秀，一次开发，多端运行。"}]}],"title":{"mainTitle":"mPaaS","subtitle":"源自于支付宝小程序框架，亿级线上业务体量的锤炼，安全性媲美支付宝原生能力。不仅面向自有 App 投放小程序，更可快速构建打包，覆盖支付宝、淘宝、钉钉等应用。","linkUrl":"https://www.aliyun.com/product/mobilepaas/mpaas-miniprogram","btnText":"查看详情"},"visual":{"topbg":"https://img.alicdn.com/tfs/TB1bQuBIYH1gK0jSZFwXXc7aXXa-3840-740.gif","icon":"","textColor":"dark"},"dataList":[{"summary":"啦啦啦","author":"wuwu","linksUrl":"#"}],"sceneCard":[],"txt":[]}}