Recent questions tagged MySQL

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mysql - Value '0000-00-00' can not be represented as java.sql.Date

I'm working on some project which needs to extract data from DB and I use Spring MVC to build model from DB ... but the actual type is Date. 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 - Troubles of adding a new ID (auto increment) after table exist

I have a table with 38.000 records, but without any auto increment column like ID. Now I have to add an ... m wondering could there be troubles? 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 distinct records on a join

I have two mysql tables - a sales table: +----------------+------------------------ ... specify DISTINCT or use a LEFT OUTER JOIN or something? 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 - Using Pentaho Kettle, how do I load multiple tables from a single table while keeping referential integrity?

Need to load data from a single file with a 100,000+ records into multiple tables on MySQL maintaining ... Creating a New Database Connection 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 - XAMPP Start automatically on Windows 7 startup

XAMPP Version 3.2.1 installed on Windows 7. It didn't get started automatically on Windows boot. Tried: ... shows neither Apache nor 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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452 views

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mysql - Is cross-table indexing possible?

Consider a structure where you have a many-to-one (or one-to-many) relationship with a condition (where, ... tableTwo_eventTime desc limit 0,10; See Question&Answers more detail:os...

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

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502 views

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mysql - Selecting first and last values in a group

I have a MySql table consisting of daily stock quotes (open, high, low, close and volume) which I'm trying ... carry any record for that date. See Question&Answers more detail:os...

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

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580 views

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mysql - Varchar to number conversion for sorting

I have a query ordered by column: select * from mytable order by column asc - sort table column type is varchar, so ... is: 1 10 11 12 13 100 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 - What is the SQL command to return the field names of a table?

Say I have a table called myTable. What is the SQL command to return all of the field names of this ... for other database systems 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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mysql - How to improve INSERT INTO ... SELECT locking behavior

In our production database, we ran the following pseudo-code SQL batch query running every hour: INSERT INTO ... do the query there. See Question&Answers more detail:os...

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

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653 views

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mysql - Can you automatically create a mysqldump file that doesn't enforce foreign key constraints?

When I run a mysqldump command on my database and then try to import it, it fails as it attempts to ... import it without manually updating 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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mysql - How to debug a query in extbase?

$query = $this->createQuery(); return $query->matching($query->like('linker', "$linkerKey=$linkerValue")) -> ... just receive a blank page. See Question&Answers more detail:os...

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

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529 views

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mysql - Can a foreign key act as a primary key?

I'm currently designing a database structure for our team's project. I have this very question in mind ... sure answer to my questions. See Question&Answers more detail:os...

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

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536 views

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mysql - Import CSV to Update rows in table

There are approximately 26K products (posts) and each product has meta values like this: The post_id column is ... by using LOAD DATA INFILE. See Question&Answers more detail:os...

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

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778 views

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mysql - Incorrect integer value: '' for column 'id' at row 1

I am trying to insert into my mySQL database. The first column is the 'id' column, since its an auto_increment ... '$nte', '$jobSiteNumber')"; See Question&Answers more detail:os...

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

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591 views

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mysql - order sql tree hierarchy

What is the best way to sort a table like this: CREATE TABLE category( id INT(10), parent_id INT(10), ... too many people got confused, sorry. See Question&Answers more detail:os...

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

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491 views

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mysql - getting mysql_insert_id() while using ON DUPLICATE KEY UPDATE with PHP

I've found a few answers for this using mySQL alone, but I was hoping someone could show me a way to ... to the PHP mysql_insert_id() function? See Question&Answers more detail:os...

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

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576 views

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mysql - Set the variable result, from query

When I create the saved procedure, i can create some variable yes? for example: CREATE PROCEDURE `some_proc` () BEGIN ... (*) FROM mytable ; ? See Question&Answers more detail:os...

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

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701 views

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mysql - Why INSERT IGNORE increments the auto_increment primary key?

I wrote a java program that accesses a MySQL innodb database. Whenever an INSERT IGNORE statement encounters a ... CHARSET=latin1; 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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924 views

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mysql - Remove trailing zeros in decimal value with changing length

I have a procedure I am doing that displays odds but the client wants only significant digits to be shown. So, 1. ... 2 4.45 Thanks for any 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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836 views

1 answer

mysql - Alter table without locking the entire table

Does ALTER TABLE sample ADD COLUMN `hasItem` tinyint(1) DEFAULT NULL lock the entire 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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502 views

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mysql - Creating DATETIME from DATE and TIME

Is there way in MySQL to create DATETIME from a given attribute of type DATE and a given attribute of type TIME? See Question&Answers more detail:os...

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

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581 views

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mysql - Export list of pretty permalinks and post title

Looking for a way to export a list of pretty permalinks in WordPress with the corresponding post title. Looking ... prefer the full permalink. See Question&Answers more detail:os...

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

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465 views

1 answer

mysql - Cannot install mysql2 gem

I'm unable to install the mysql2 gem in my Windows7 x64 system. I tried using both the 32-bit and ... this gem properly installed and working. 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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mysql - joining two select statements

Can anyone tell me why the following won't work? It complains of a syntax error near the join key word between ... C.orders_id = D.orders_id ) See Question&Answers more detail:os...

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

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736 views

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mysql - How do I add two count(*) results together on two different tables?

I have two tables: Toys and Games. +--------------------+------------------+ | Field | Type ... . Let's assume that we can't change the schema.) See Question&Answers more detail:os...

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

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717 views

1 answer

mysql - Can I use VARCHAR as the PRIMARY KEY?

I have a table for storing coupons/discounts, and I want to use the coupon_code column as the primary key, ... 'm missing/not thinking about. See Question&Answers more detail:os...

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

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600 views

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mysql - Native table 'performance_schema'.'???' has the wrong structure

I am getting the following: Native table 'performance_schema'.'file_instances' has the wrong structure Native table ' ... server has gone away" See Question&Answers more detail:os...

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

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