Recent questions tagged database

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I want to query the id of all apartments that were never rented I tried something like this: (π a_id ( ... Thanks I attach the schema here See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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659 views

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database - Mysql service won't start, InnoDB init function error

So seemingly out of nowhere tonight, my wordpress site went down and I've traced it to problems with mysql. ... ideas? I appreciate the help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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database - MySQL and PDO: Could PDO::lastInsertId theoretically fail?

I have been pondering on this for a while. Consider a web application of huge proportions, where, let's say, ... database, just to be sure? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Golang ORDER BY issue with MySql

I can't seem to dynamically ORDER BY with db.Select(). I've Googled without any luck... WORKS rows, err : ... , the query simply fails to order. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Android NullPointerException + GetDatabaseLocked

I have got a problem with my programm. I use a database to save the settings of my app. When I save the ... help and sorry for my english :D See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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889 views

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database - Predict next auto-inserted row id (SQLite)

I'm trying to find if there is a reliable way (using SQLite) to find the ID of the next row to ... functionality is that nothing gets changed. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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637 views

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database design - How to choose the clustered index in SQL Server?

Usually the clustered index is created in SQL Server Management Studio by setting the primary key, however my recent ... that the best choice? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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669 views

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database partitioning - What's a good balance to decide when to partition a table in BigQuery?

We are using a public dataset to benchmark BigQuery. We took the same table and partitioned it by day, but it ... an email I received today) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How do you deal with blank spaces in column names in SQL Server?

Suppose I want to use code like this: select 'Response Status Code', 'Client Response Status Code' from TC_Sessions ... SQL Server? thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Any example of a necessary nullable foreign key?

Customers customer_id Orders order_id customer_id fk If I have two tables and define a foreign key on customer_id ... favor of permitting them? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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database migration - No connection string named 'MyApplicationEntities' could be found in the application config file

I just install EF 4.3 and trying to upgrade my project with migration. however I am getting issues with ... got an answer. Appreciate Sanj. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Knex Transaction with Promises

I am getting the correct output, and indeed, these two operations are being treated as a single transactional ... still. Looking for comments. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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689 views

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database - SQL difference between rows

I have a SQL 2008 database table like this name score ----------------------- steve 207 steve 205 steve ... is the best way to do this? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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668 views

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database - How to text filter an Android ListView backed by a SimpleCursorAdapter?

I have a ListView that is backed by a SimpleCursorAdapter. I'd like to be able to filter the list like you would a ... ? If so, how is it done? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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599 views

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database - Does SQL Server 2005 have an equivalent to MySql's ENUM data type?

I'm working on a project and I want to store some easily enumerated information in a table. MySql's enum data ... as characters is out as well. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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597 views

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database - How do I avoid a race condition in my Rails app?

I have a really simple Rails application that allows users to register their attendance on a set of courses. The ... unless full? end end end See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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database - ROWID (oracle) - any use for it?

My understanding is that the ROWID is a unique value for each row in the result returned by a query. Why do we ... used ROWID in a SQL query? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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730 views

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database - Picking the best primary key + numbering system

We are trying to come up with a numbering system for the asset system that we are creating, there has been a few ... answers, has help me a lot. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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database - SQL query to find record with ID not in another table

I have two tables with binding primary key in database and I desire to find a disjoint set between them. For ... two tables. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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788 views

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database - How to store Query Result in variable using mysql

SET @v1 := SELECT COUNT(*) FROM user_rating; SELECT @v1 When I execute this query with set variable this error is ... Total Time : 00:00:00:343 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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763 views

1 answer

database - How do I kill all the processes in Mysql "show processlist"?

Because I see a lot of processes there, and the "time" column shows big values for all of them. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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728 views

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database - Adding a new value to an existing ENUM Type

I have a table column that uses an enum type. I wish to update that enum type to have an additional possible ... the simplest way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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database design - A column as primary key or two foreign keys as primary key

I have the following database design: An E-Report has one QAP which has some Requirements. A QAP and its ... mine. What do you think? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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database - Need help in developing DB logic

This is a mini-project of mine - Airline reservation system - lets call this airline FlyMi : I have a database ... efficient logic to do this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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database - Count array elements that matches condition

I have a mongoDB collection called "conference" with an array of participants as below : [ { "_id" : ... origin" : "external"} ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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693 views

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database - Image retrieval system by Colour from the web using C++ with openframeworks

I am writing a program in C++ and openFrameworks that should hopefully implement an image retrieval system by ... output the closest match. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

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database - #1130 - Host ‘localhost’ is not allowed to connect to this MySQL server

I issued a command of: DROP USER 'root'@'localhost'; GRANT ALL PRIVILEGES ON . TO 'root'@'%'; ...in ... MySQL server, how to resolve my problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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857 views

1 answer

database - MySQL 5.5 foreign key constraint fails when foreign key exists

Just installed MySQL 5.5 on mac os x 10.6 and am having a strange issue on many tables. Below is an ... .8 seems to work. Extremely surprising. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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