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Recent questions tagged Database

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database - Python Disk-Based Dictionary

I was running some dynamic programming code (trying to brute-force disprove the Collatz conjecture =P) and I ... out in some efficient manner? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

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database - Maximum concurrent connections to MySQL

I want to set up a MySQL database for a social networking website for my college. My app can have ... of concurrent MySQL connections possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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738 views

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database - Storing Credit Card Number - PCI?

What are the PCI rules to follow for storing credit card numbers in a database? 1) is this allowed? 2) if ... document should I be reading here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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database - SQL, Postgres OIDs, What are they and why are they useful?

I am looking at some PostgreSQL table creation and I stumbled upon this: CREATE TABLE ( ... ) WITH ( OIDS = ... shorter? when should it be used? See Question&Answers more detail:os...

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

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1.0k views

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database - phpMyAdmin - Error > Incorrect format parameter?

I have a WordPress production website. I've exported the database by the following commands: select database > ... database or other? 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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790 views

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database - Oracle TNS names not showing when adding new connection to SQL Developer

I'm trying to connect to an oracle database with SQL Developer. I've installed the .Net oracle drivers and ... there something I'm missing? 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 - Foreign Key naming scheme

I'm just getting started working with foreign keys for the first time and I'm wondering if there's a standard ... key names, not field names! See Question&Answers more detail:os...

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

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775 views

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database - How to find the mysql data directory from command line in windows

In linux I could find the mysql installation directory with the command which mysql. But I could not find ... returned from the command line. See Question&Answers more detail:os...

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

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647 views

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database - Update MySQL version from 5.1 to 5.5 in CentOS 6.2

I tried to update MySQL from 5.1 to 5.5 in CentOS 6.2. The following is the process I did: 1. rpm -Uvh ... --nofiles --nodigest How to fix it? See Question&Answers more detail:os...

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

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633 views

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database - Derived account balance vs stored account balance for a simple bank account?

So, its like our normal bank accounts where we have a lot of transactions which result in inflow or outflow of money ... on this? Thanks 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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599 views

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database - What is sharding and why is it important?

I think I understand sharding to be putting back your sliced up data (the shards) into an easy to deal with ... it apply to smaller scale ones? See Question&Answers more detail:os...

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

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909 views

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database - How can I stop redis-server?

I apparently have a redis-server instance running because when I try to start a new server by entering redis-server, ... My OS is Ubuntu 10.04. See Question&Answers more detail:os...

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

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780 views

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database - What are OLTP and OLAP. What is the difference between them?

Actually what do they mean? All articles I find about them don't give me an idea, or my knowledge is too ... I can learn this from scratch. See Question&Answers more detail:os...

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

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667 views

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database - Store two Queries result in third variable

What's wrong with this code: Visual Basic 6.0 With access 2007 Private Sub Command1_Click() Dim Sell_tbl, Stock_Bottle ... . Can anyone help me? See Question&Answers more detail:os...

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

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746 views

1 answer

database - Android SQLite Column Not Found Error When Executing Raw Query

I am making an android app that searches for restaurants in a SQLite database. I currently use a custom loader ... ; } Cursor oldCursor=lastCursor; lastCursor=cursor; if (isStar...

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

0 votes

1.3k views

1 answer

database - Recursive MySQL Query with relational innoDB

I've got a table structure like (simplified): content - id_content - my_string1 - ... ... recursive alternative. Thanks daniel See Question&Answers more detail:os...

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

0 votes

914 views

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database - Java Oracle localhost connection error (ORA-12505)

I am trying to currently connect to a database on my current computer. import java.sql.Connection; import java.sql ... .0.1 instead of localhost See Question&Answers more detail:os...

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

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706 views

1 answer

database - PHP dehashing the password

Ok. thats clear that one must store hashed password in the database but in case a user does not remembers ... to retrieve back the password. See Question&Answers more detail:os...

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

0 votes

603 views

1 answer

database - Pivoting EAV data from the client to a Relational Model on the server

I am building a software platform for mobile electronic data collection. It should support any type of data. For ... to solve this problem? See Question&Answers more detail:os...

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

0 votes

983 views

1 answer

database - Access from PHP to .mdb file on Ubuntu

I've got a problem of obtaining access to .mdb file (MS-Access db) on Ubuntu. I need full access(read and ... against it. Thanks for any help. See Question&Answers more detail:os...

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

0 votes

730 views

1 answer

database - What is the best way to synchronize data between MS Access and MySQL?

I have an access database on a windows machine, which I must import into mysql on a linux webserver. At ... ones that were purposefully deleted. See Question&Answers more detail:os...

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

0 votes

805 views

1 answer

database - How to create ID column in R

I have a longitudinal data in a long format. I want to create an ID variable based on the variable-column that identifies ... 2 3 5 1 Any help? See Question&Answers more detail:os...

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

0 votes

652 views

1 answer

database design - how to represent symmetric many to many relationship

suppose i have a entity called USER and a relationship FRIENDSHIP exist between two USERs SO for that i have a ... to reduce this redundancy ? See Question&Answers more detail:os...

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

0 votes

663 views

1 answer

database - Is SQL order by clause guaranteed to be stable ( by Standards)

I am using following query to query DB which have order by on two columns. SELECT a,b,c from Table1 Order By ... it also does not require it. See Question&Answers more detail:os...

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

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686 views

1 answer

database - Understanding COMPATIBILITY_LEVEL in SQL Server

I understood that setting a database to a COMPATIBILITY_LEVEL prior to your native one prevented features from ... would have been appropriate See Question&Answers more detail:os...

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

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710 views

1 answer

database - Oracle not distinguishing between nulls and empty strings?

Apparently oracle doesn't seem to distinguish between empty strings and nulls. E.g. Select name from TABLE_A where ... answer to this question.) See Question&Answers more detail:os...

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

0 votes

673 views

1 answer

database - Android application with phone book synchronization?

I am creating one android test application , in which i have one button. On button click ,i want to synchronize ... so how can i do this? See Question&Answers more detail:os...

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

0 votes

630 views

1 answer

database - Does MySQL view always do full table scan?

I'm trying to optimize a query which uses a view in MySQL 5.1. It seems that even if I select 1 column from the ... : 17 rows in set (0.18 sec) See Question&Answers more detail:os...

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

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