sql tag

625 questions

1 answers
58 views
0

Understanding Differences in Query Behavior in mysql Connection Pools

const mysql=require(mysql);const config = { host: '127.0.0.1', user: 'root', password:', database: test, connectionLimit:10}const pool = mysql.createPool(config);letstrQuery='SELECT* FROM `test';// g ...

javascript mysql node.js

2 years ago

1 answers
43 views
0

File sort occurs even if compound index is used when using in clause and order by

The following table adds a composite index of id, position to .+--------------------+| id|position|+------+----------+| 1 | 1 || 2 | 2 || 3 | 5 || 4 | 4 |+------+----------+show index from test;+-...

mysql sql

2 years ago

1 answers
48 views
0

If id is null after left join in mysql, the join condition disappears.

We have tables A, B, and C, and we would like to find A related to a particular C.SELECT* FROM A A INNER JOIN B ON b.id = a.b_id LEFT JOIN CC ON c.b_id=b.id AND c.type='hogehoge'WHERE c.id IS NULLAt t...

mysql

2 years ago

4 answers
168 views
0

Want to know best design practices when you want to filter a table with multiple conditions in RDB

I'd like to know the best design practice when you want RDB to filter a table under multiple conditions (including AND/OR).For example, table name:sample_tableSchema: - id integer - name varchar - co...

mysql sql database-design

2 years ago

2 answers
46 views
0

I want to add serial numbers in groups in SQL of MySQL

I use MySQL 5.6.What kind of SQL is common for RDBMS SQL that does not have an analysis function?Please let me know if there is any SQL that can be resolved, even if it is not common.Thank you for you...

mysql sql

2 years ago

1 answers
46 views
0

If id is null after left join in mysql, the join condition disappears.

mysql

2 years ago

1 answers
73 views
0

Error in Logstash Output to PostgreSQL

Logstash displays the following error when outputting to Postgresql:[ERROR][org.logstash.Logstash]java.lang.IllegalAccessError: tried to access class org.postgresql.Driver$ConnectThread from class org...

postgresql

2 years ago

1 answers
43 views
0

"user does not exist" error when running SQL DDL

As per the title, when running DDL on Oracle SQL Developer What should I do if I see an error similar to the following?error message ORA-01435—User does not exist.01435.00000 - user does not existSQL ...

sql

2 years ago

1 answers
51 views
0

How to pass the jQuery Rating to PHP with the submit button

I would like to use jQuery Rate (http://wbotelhos.com/raty) to give a five-step rating to the form of posting a review of a book.<form action=review.php method=post> <label class=control-labe...

javascript php jquery mysql

2 years ago

1 answers
127 views
0

I want to run multiple queries on node.js and mysql

I have been trying to create a site using node.js and javascript while searching various ways.I'm trying to write a code to send the results of multiple queries to ejs, but I get an error.If you do re...

mysql node.js

2 years ago

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