innodb | innodb分析版本 -

by yuanrongxi C++ Version: Current License: Non-SPDX

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kandi X-RAY | innodb Summary

innodb is a C++ library. innodb has no bugs, it has no vulnerabilities and it has low support. However innodb has a Non-SPDX License. You can download it from GitHub.

innodb

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Support

innodb has a low active ecosystem.

It has 57 star(s) with 28 fork(s). There are 7 watchers for this library.

It had no major release in the last 6 months.

innodb has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of innodb is current.

Quality

innodb has 0 bugs and 0 code smells.

Security

innodb has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

innodb code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

innodb has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

innodb releases are not available. You will need to build from source code and install.

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innodb Key Features

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innodb Examples and Code Snippets

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Community Discussions

Trending Discussions on innodb

Does the column order matter in a WHERE SQL statement

Select cashiers who sold tickets for different events in the same day

Optimize query with functions in `group by` key?

TypeORM composite foreign key

Insert and query MySQL point value returns ASCII

Problem with create table Category and get the url correctly PHP

MySQL SQL Performance need some improvement

MySQL Query to list records ordered as highest & lowest value alternatively in single query

mysql : unable to create secondary server instance using mysqld

Why isn't it showing all descendant categories in breadcrumbs?

QUESTION

Does the column order matter in a WHERE SQL statement

Asked 2022-Apr-10 at 01:11

I'm working on a system with a good amount of indexes. Some indexes are simpler than others. I.e. they're INT, VARCHAR, DATETIME and in some cases ENUMS(maybe 5~25 variations).

Does the WHERE order matter? In other words, would placing the easier to search columns first increase speed/performance?

i.e. Let's say we have this table and it looks like this

...

ANSWER

Answered 2022-Apr-10 at 00:34

Does the WHERE order matter? In other words, would placing the easier to search columns first increase speed/performance?

Short answer : no.

Longer answer : SQL is a declarative, not procedural, language. It's the only declarative language most of us devs deal with regularly. The server software has query planning modules that use various schemes for figuring out the most-likely most efficient way of getting the result set from each query. The query plan can vary, even with the same query and different data. So we tell it what we want, not how to get it.

Sometimes it's necessary to adjust indexes or refactor queries to get decent performance. You can read about that in the query-optimization tag. But the refactoring is never as simple as changing the order of terms in WHERE clauses.

And, pro tip: lots of single column indexes are very rarely a good idea. Indexes need to be designed to match the shape of the queries in use. Read this ebook by Marcus Winands: https://use-the-index-luke.com

Source https://stackoverflow.com/questions/71812827

QUESTION

Select cashiers who sold tickets for different events in the same day

Asked 2022-Mar-22 at 15:47

I have next table :

...

ANSWER

Answered 2022-Mar-21 at 21:18

Try:

Source https://stackoverflow.com/questions/71564100

QUESTION

Optimize query with functions in `group by` key?

Asked 2022-Feb-21 at 18:43

I am using MySQL 8.0 and there is a slow query on a large table to be optimized.

The table contains 11 million rows of data and it's structure:

...

ANSWER

Answered 2022-Feb-21 at 05:15

I was able to eliminate the Using temporary by adding an expression index:

Source https://stackoverflow.com/questions/71201287

QUESTION

TypeORM composite foreign key

Asked 2022-Feb-14 at 20:14

In a first class, the primary key is composite:

...

ANSWER

Answered 2022-Feb-14 at 20:14

That UPDATE might benefit from some of these indexes:

Source https://stackoverflow.com/questions/70963321

QUESTION

Insert and query MySQL point value returns ASCII

Asked 2022-Feb-07 at 21:11

I have a bit of a strange problem. I’m trying to insert MySQL point coordinates and return in PHP, but I get ASCII put instead of coordinates.

This is my SQL

...

ANSWER

Answered 2021-Dec-27 at 16:23

You can use ST_AsText:

Source https://stackoverflow.com/questions/70497718

QUESTION

Problem with create table Category and get the url correctly PHP

Asked 2022-Feb-03 at 07:22

I am creating an ecommerce, which can have Men's Fashion, Women's Fashion or Children's Fashion, it could also have more in the fure like Sports, Electronics, etc.

But I don't know if I have, for example, to repeat the categories clothes, etc for each one or not, I don't know if there is a better way. Since I must also create the dynamic menu

My table structure is like this:

...

ANSWER

Answered 2022-Feb-03 at 07:22

It's that ok what I'm doing, repeat for each section the same categories as clothes, Jeans, etc.?

Yes, It's perfectly okay to do that. Personally, that is what I prefer.

What would be better: To add it directly to my table the absolute path or can i do that with PHP

You can easily achieve it with PHP.

Kindly use these functions to generate the markup for the nested categories. You can modify the HTML to achieve your desired results.

Source https://stackoverflow.com/questions/70962454

QUESTION

MySQL SQL Performance need some improvement

Asked 2022-Jan-13 at 01:35

I have worked my way around many challenges with MySQL, and i think right now i am able to build everything that i need, to get something to work. But now, for a pretty huge SQL statement that returns a lot of data, i need to work on MySQL performance for the first time.

I was hoping someone here could help me find out why the following statement is so incredibly slow. It takes over 3 minutes to collect 740 results out of different tables. The biggest table beeing the "reports" table, consisting of somewhere over 20.000 entries at the moment.

I can also educate myself if someone could just point me in the right direction. I don't even know where to search for answers for my current problem.

Okay, so here is the statement that i am talking about. Maybe, if someone has enough experience with SQL performance, something just right away jumps at them. I would be happy for any kind of feedback. I'll elaborate on the statement right after the code itself:

...

ANSWER

Answered 2022-Jan-13 at 01:03

Let's start by adding an index for each of the foreign keys used in your query -

Source https://stackoverflow.com/questions/70685919

QUESTION

MySQL Query to list records ordered as highest & lowest value alternatively in single query

Asked 2022-Jan-06 at 07:49

I've got a table of participant teams who're playing against each other and the table contains the overall previous score of teams. What I want to do is fetch all the team records ordered as the highest score, lowest score, second-highest score, second-lowest score, and so on.

because I want to pair the team with the highest score with the team with the lowest score.

Here's my DB schema,

...

ANSWER

Answered 2022-Jan-06 at 07:49

if your MySQL version support ROW_NUMBER window function you can try to use ROW_NUMBER to do a simple formula to make a group be order by number then use abs function to get absolute value

Source https://stackoverflow.com/questions/70603702

QUESTION

mysql : unable to create secondary server instance using mysqld

Asked 2021-Dec-21 at 10:23

I am using mysqld to create an new server along with the existing one[ MYSQL 8.0.27 installed with the windows installer] to test data replication

I already have an instance of the server installed [called Mysql80] which is the original server and i am trying to create another server called MyTest using mysqld by reading this documentation which seems simple enough

i have created an empty Data directory to hold my new database and my configuration file for the server is saved as conf.cnf

...

ANSWER

Answered 2021-Dec-21 at 10:23

Turns out i was doing two things wrong

I had previously upgraded from mysql 8 to 8.27 hence tables were corrupted which explained the Optimization errors
My config wasn't in the correct format

After deleting the MySQL service from windows services and deleting my data directory these 3 steps need to be performed in order

Create an new directory to store Data, your config file , upload directory[To Use commands like LOAD FILE]

The structure looks like this

Source https://stackoverflow.com/questions/70325964

QUESTION

Why isn't it showing all descendant categories in breadcrumbs?

Asked 2021-Dec-19 at 00:42

When searching by product category, I need to display all of its parent categories.

When there are multiple levels, it only displays two results.

...

ANSWER

Answered 2021-Dec-19 at 00:22

Well, you only join one level. If you want to join arbitrary levels, you can use a recursive CTE.

Source https://stackoverflow.com/questions/70408098

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

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Install innodb

You can download it from GitHub.

Support

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