Recent questions tagged MySQL

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mysql - SQL How to replace values of select return?

In my database (MySQL) table, has a column with 1 and 0 for represent true and false respectively. But in SELECT, ... | false 3 | Jessica | true See Question&Answers more detail:os...

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

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mysql - A datetime equivalent in java.sql ? (is there a java.sql.datetime ?)

So far, I have not found a clear answer to this. I'd like to know what the equivalent is for a SQL type ... hints? Edit: I am using MYSQL. See Question&Answers more detail:os...

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

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mysql - Repository of BNF Grammars?

Is there a place I can find Backus-Naur Form or BNF grammars for popular languages? Whenever I do a search ... for Objective-C and maybe MySQL. See Question&Answers more detail:os...

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

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mysql - Select records from NOW() -1 Day

Is there a way in a MySQL statement to order records (through a date stamp) by >= NOW() -1 so all ... before today to the future are selected? See Question&Answers more detail:os...

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

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mysql - How to store data with dynamic number of attributes in a database

I have a number of different objects with a varying number of attributes. Until now I have saved the data ... searches easier. Any ideas? See Question&Answers more detail:os...

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

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mysql - How to enable explicit_defaults_for_timestamp?

When I try to start my mySQL server I get message: [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. ... how to enable it? Where? See Question&Answers more detail:os...

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

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mysql - Can't drop table: A foreign key constraint fails

In MySQL I want to drop a table. I tried a lot things but I keep getting the error that the table named ... fails How do I drop this table? See Question&Answers more detail:os...

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

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mysql - Does mysqldump support a progress bar?

Is there any way to determine, while mysqldump is running, how much of the backup has completed or how much is remaining? See Question&Answers more detail:os...

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

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mysql order by, null first, and DESC after

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

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mysql - Errors Installing mysql2 gem via the Bundler

I am trying to install the mysql2 gem via the Bundler, but it keeps dying with the following error: ** ... mysql5/mysql/mysql.h Any thoughts? See Question&Answers more detail:os...

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

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mysql - How to deal with enormous line lengths created by mysqldump

I'm using mysqldump in a cron job to backup a database with over 2 million rows. It creates a text file which ... with tools like sed or Perl? See Question&Answers more detail:os...

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

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mysql - How to make Sequelize use singular table names

I have an model called User but Sequelize looks for the table USERS whenever I am trying to save in the DB ... use singular table names? 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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mysql - When to use LEFT JOIN and when to use INNER JOIN?

I feel like I was always taught to use LEFT JOINs and I often see them mixed with INNERs to accomplish the same ... be INNER is there any catch? See Question&Answers more detail:os...

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

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666 views

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mysql - mysqld: Can't change dir to data. Server doesn't start

I installed a MySQL server with installer and it started. After reboot I tried to start it again and get ... as administrator, nothing happens. See Question&Answers more detail:os...

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

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mysql - Database schema for ACL

I want to create a schema for a ACL; however, I'm torn between a couple of ways of implementing it. I ... there other schema layouts for ACL? See Question&Answers more detail:os...

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

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684 views

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mysql - How to Import 1GB .sql file to WAMP/phpmyadmin

I want to import over 1GB size sql file to MySQL database in localhost WAMP/phpmyadmin. But phpmyadmin UI doesn't ... import .sql file ? 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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885 views

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mysql - Can't connect to RDS instance from EC2 instance

From EC2 instance i-78a8df00, I'm trying to connect to RDS instance mysql.************.us-east-1.rds. ... forum solutions but those don't 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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585 views

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mysql - Setting up table relations what do "Cascade", "Set Null" and "Restrict" do?

I want to start using table relations in a new project. After some googling I got 2 tables set up as InnoDB ... do it would be much appreciated. See Question&Answers more detail:os...

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

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526 views

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mysql - What difference between the DATE, TIME, DATETIME, and TIMESTAMP Types

I need to store both time and date in the mysql. So I used of NOW() function for that. But I don't know ... INTO table (timedate) VALUES (NOW()) See Question&Answers more detail:os...

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

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446 views

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mysql - DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled

While importing the database in mysql, I have got following error: 1418 (HY000) at line 10185: This function has ... me how to resolve 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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533 views

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mysql - Database modeling for international and multilingual purposes

I need to create a large scale DB Model for a web application that will be multilingual. One doubt that I've ... model this in a big scale? See Question&Answers more detail:os...

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

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613 views

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mysql - How to find duplicates in 2 columns not 1

I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they ... MySQL version 4.1.22 See Question&Answers more detail:os...

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

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801 views

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mysql - varchar(255) vs tinytext/tinyblob and varchar(65535) vs blob/text

By definition: VARCHAR: The range of Length is 1 to 255 characters. VARCHAR values are sorted and compared in case- ... 1) characters x+2 bytes See Question&Answers more detail:os...

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

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549 views

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mysql - 1030 Got error 28 from storage engine

I am working on a project where i need to create a database with 300 tables for each user who wants to see ... the same issue again and again. See Question&Answers more detail:os...

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

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513 views

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mysql - How to convert all tables in database to one collation?

I'm getting error: Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='" ... be done with 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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464 views

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mysql - What does it mean by select 1 from table?

I have seen many queries with something as follows. Select 1 From table What does this 1 mean, how will it be ... scenarios, can this 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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603 views

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mysql - How to stop mysqld

To find out the start command for mysqld (using a mac) I can do: ps aux|grep mysql I get the following ... to stop mysql 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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mysql - How to generate a create table script for an existing table in phpmyadmin?

How can I generate a create table script for an existing table in phpmyadmin? See Question&Answers more detail:os...

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

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