Collection of solutions to common MySQL errors

In development, if you often deal with MySQL, you will encounter some common errors. Some errors will cause MySQL to not work properly, and some will affect the performance of the program. Here are some common MySQL errors and their solutions.

1. MySQL server cannot be connected

When connecting to the MySQL server, you may encounter the following error:

Can't connect to MySQL server on 'localhost' (10061)

Access denied for user 'root'@'localhost' (using password: YES)

At this time, you need to check the following:

1. Whether the MySQL server has been started.
2. Is the port number correct?
3. Are the username and password correct?
4. Is there a firewall blocking the connection?

If there is no problem with the above, you can try entering the following command on the command line:

mysql -u root -p

If you can connect normally, then the problem may lie in the program.

2. Error 1064

When executing MySQL statements, you may encounter error 1064:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'LIMIT 10' at line 1

This error is usually caused by syntax errors . You need to check whether the syntax of the SQL statement is correct, whether there are missing keywords or spelling errors.

3. Error 1045

When connecting to MySQL, you may encounter the following error:

Access denied for user 'root'@'localhost' (using password: YES)

This error is usually caused by an incorrect password. You need to check whether the MySQL username and password are correct.

4. Error 2002

When connecting to MySQL, you may encounter the following error:

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

This error is usually because the MySQL server has not started or Already closed. You can try starting the MySQL server in the command line:

sudo service mysql start

5. Error 1215

When creating a MySQL table, you may encounter error 1215:

Cannot add foreign key constraint

This error is usually caused by foreign key constraints. You need to check whether the relationships between tables are correct and whether there are grammatical errors or spelling errors.

6. Error 1054

When executing MySQL statements, you may encounter error 1054:

Unknown column 'column_name' in 'field list'

This error is usually caused by incorrect column names. of. You need to check whether the column names are correct and whether there are grammatical errors or spelling errors.

7. Error 1136

When executing a MySQL statement, you may encounter error 1136:

Column count doesn't match value count at row 1

This error is usually caused by inserting data into the column Caused by number mismatch. It is necessary to check whether the inserted data matches the table structure and whether there are missing or extra columns.

Summary

The above are common MySQL errors and their solutions. During development, don't panic when you encounter an error. You can read the error message carefully, gradually find out the problem through troubleshooting, and then take corresponding solutions. At the same time, you can summarize your own set of solutions based on experience for future reference.

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