join | 易学教程

使用kubeadm 新加入节点（原始token过期后）---转发

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使用kubeadm 新加入节点（原始token过期后）---转发 kubeadm token create --print-join-command https://www.cnblogs.com/xiaoyaojinzhazhadehangcheng/p/11605934.html 最简单的方法 kubeadm join kubeadm init 安装完成后你会得到以下的输出，使用join指令可以新增节点到集群,此token 有效期为24小时 You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of machines by running the following on each node as root: kubeadm join 18.16.202.35:6443 --token zr8n5j.yfkanjio0lfsupc0 --discovery-token-ca-cert-hash

How to fetch all rows with left join getting the latest row in second table

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问题 I am trying to follow the instructions in this answer how to get the latest row in the joined table. I have two tables. Projects : id, title Status : project_id, status_id, created(DATETIME) When I know the project ID (example = 2) I have the correct query to select the latest status update. SELECT projects. * , project_state_project_map.status_id AS status, project_state_project_map.created AS status_created FROM projects LEFT JOIN ( SELECT * FROM project_state_project_map WHERE project_id =

How to drop rows that are not exact duplicates but contain no new information (more NaN)

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问题 My goal is to collapse the below table into one single column. For this question specifically, I am asking how I can intelligently delete the yellow row because it is a duplicate of the gray row, although with less information. The table has three categorical variables and 6 analysis/quantitative variables. Columns C1 and C2 are the only variables that need to match for a successful join; all of the . All blank cells are NaNs and python code for copying is below. Question 1 . (Yellow) All of

Joining 3 tables with n:m relationship, want to see nonmatching rows

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问题 For this problem, consider the following 3 tables: Event id (pk) title Event_Category event_id (pk, fk) category_id (pk, fk) Category id (pk) description Pretty trivial I guess... :) Each event can fall into zero or more categories, in total there are 4 categories. In my application, I want to view and edit the categories for a specific event. Graphically, the event will be shown together with ALL categories and a checkbox indicating whether the event falls into the category. Changing and

Integrating apache ignite in legacy java sql based project joins issue

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问题 I have a legacy java project where I have more than 1000 table and a lot of SQL queries. In order to achieve a better querying performance I m studying the apache ignite in memory database where I wan't to use the 3rd party persistence mechanism, the later is based on caching (CacheStore) that I implemented successfully in my POC, unfortunately I have lot of complex queries with lot of joins, in this case I have to update my queries using cache store names as in the example private static

MySQL LEFT JOIN — How to still return results when leftmost table is empty?

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问题 I am trying to combine three separate queries into one. Each query selects a different column from a different table, but the tables do have some columns in common. What I tried doing was LEFT JOINing two of the tables to the other, and this works great as long as the leftmost table returns a result. But if the leftmost table does not return a result, then no result is returned at all (even if the two queries being LEFT JOINed have results). Pseudo code: SELECT a.col_1, b.col_2, c.col_3 FROM

How to print posts and comments with only one sql query

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问题 Is it possible to print out (PHP) all my blog posts + associated comments via one sql query? If so, how? I was thinking in this direction: SELECT p.post_id, p.title, c.comment_body FROM posts p LEFT JOIN comments c ON c.parent_id = p.post_id But this didn't work out as I expected 回答1: Using one SQL query is not very convenient, since you have 1 post and multiple comments. Having the post details added to each comment (in a combined query) is a waste of resources. It is much more convenient to

Ambiguous Outer Joins?

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问题 I am getting the following error message... "The SQL statement could not be executed because it contains ambiguous outer joins. To force one of the joins to be performed first, create a separate query that performs the first join and then include that query in your SQL statement." HOW CAN I FIX THIS??? If i replace the "LEFT JOIN" with "INNER JOIN" the bug goes away but the desired operation is not accomplished. Here is my code: SELECT route.productfam, facility.location, asmlines.line,

Use table column value for LIMIT when performing join

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问题 I have a situation where I'm performing a join between two tables, and I need a value from one table to be used as a LIMIT factor for a subquery in the join. Assume I have the following [extremely simplified] tables - data: experiment_id | value --------------|-------- 1 | 2.5 1 | 2.6 1 | 4.5 1 | 2.3 1 | 3.5 1 | 2.8 2 | 2.3 2 | 1.2 2 | 1.1 2 | 3.6 2 | 3.8 2 | 4.1 2 | 7.9 2 | 4.2 2 | 1.0 data_clip: experiment_id | clip_index --------------|------------ 1 | 3 2 | 5 I need to sum each experiment

Use table column value for LIMIT when performing join

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