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php - In mysql, is it more efficient to use int type as a primary key field than char type?

In mysql, is it more efficient to use int type as a primary key field than char type? Due to business requirem...

From [MySQLdiscussion group] 2017-05-25 15:08:20 0  2  922

php - Login verification issue with TP5

One problem that should be relatively trivial is that when I deal with the front-end and back-end, I need to d...

From [MySQLdiscussion group] 2017-05-25 15:08:19 0  5  1220

php - How to ensure data security when one operation requests multiple services?

An order operation to purchase goods. To simultaneously reduce user points, insert an order. In the same libra...

From [MySQLdiscussion group] 2017-05-25 15:08:18 0  3  960

When php queries MySQL too much, the web page will hang. How to solve this problem?

I recently changed the server and reinstalled the system. I don’t know if it’s an incorrect configuration. Whe...

From [MySQLdiscussion group] 2017-05-25 15:08:16 0  3  737

mysql update query update A SET acid = (SELECT);

I wonder if there is a way to complete this update? {code...}

From [MySQLdiscussion group] 2017-05-25 15:08:15 0  1  712

mysql - thinkphp3.2 csv batch import of tens of thousands of data reports a timeout error. Is there any good way to deal with it?

{Code...} Upload a CSV file, and an error will be reported after execution. Please give me some advice. PS: Yo...

From [MySQLdiscussion group] 2017-05-25 15:08:12 0  1  822

php - mysql multi-table query

There are two tables, briefly describe them. Table 1: Relationship table between courses and students rsid cid...

From [MySQLdiscussion group] 2017-05-25 15:08:10 0  3  862

Java - When inserting data with empty value into the database, it says that my data is too long.

When inserting null data into the database, the error Data truncation: Data too long for column 'REPLY_TYPE' a...

From [MySQLdiscussion group] 2017-05-25 15:08:09 0  2  773

python - How to execute multiple SQL statements at once

Suppose there are multiple such statements: {code...} We can summarize it into the format of select xxx from y...

From [MySQLdiscussion group] 2017-05-25 15:08:08 0  1  2210

mysql optimization - mysql innodb table lock, beg the DBA expert for answers

Questions: 1. When transactions are not enabled in innodb and autocommit=1, will update and delete cause table...

From [MySQLdiscussion group] 2017-05-25 15:08:06 0  1  872

mysql - How to connect two select results in sql statement?

As shown in the figure, these two results are obtained from the select query. How to join them together?

From [MySQLdiscussion group] 2017-05-25 15:08:05 0  2  966

mysql - Why does database read-write separation improve database performance?

Please see the blog above for why read-write separation can improve database performance. According to databas...

From [MySQLdiscussion group] 2017-05-24 11:34:46 0  2  1423

mysql - How does phpmyadmin export data in sections?

My database has 1.9 gigabytes. How can I export a 100M file in batches?

From [MySQLdiscussion group] 2017-05-24 11:34:42 0  4  1174

mysql cache issue

1. The database mysql, the persistence layer uses mybatis2. Now I have configured two data sources A and B, bu...

From [MySQLdiscussion group] 2017-05-24 11:34:40 0  1  813

mysql - database multi-table joint query inserting into other libraries

The table is almost the same as below Library A table 1 content {code...} Table 2 area {code...} Table 3 categ...

From [MySQLdiscussion group] 2017-05-24 11:34:39 0  1  910