What is the “unknown column field in MySQL”?
The unknown column field in MySQL is an error with code 1054; it can also be said as MySQL error 1054.
If you are getting this error, you have missed something while creating a table or updating it.
When does it occur? Reasons with Solution.
- When the query is not quoted correctly.
The query should be quoted with double quotation marks, but the string or Varchar value must be quoted with single quotation marks.
Inappropriate use of quotation marks will produce this error.
2. When some issue in the CREATE_TABLE and UPDATE statements.
While creating a table or updating it, ensure that this does not contain any unnecessary space or wrong character.
3. When the column is missing in database_table.
If the column is missing in the database table, it will also throw this error. To remove this, we will add a column by ALTER SQL query.
But first, we will rectify the database of the working site on localhost. Then, we will only export the problematic table on the live site.
first, we search through the database of the localhost site
then click on the Export tab.
Then, select table to export.
Then, click Go, and after that, we save the file and open it using code-editor.
To add the column, write ALTER query as follows:
ALTER TABLE<table_name> ADD<column_name> <datatype> AFTER<after_column>
4. When the column name in CREATE_TABLE and UPDATE statement are not the same.
Although they look the same but show an error, that could be because of the Unicode characters.
So, in that case, we will also alter the column-name into ASCII characters.
“Unknown column field in MySQL” is an error that arises for many reasons, the most common reasons we have mentioned along with the solution.
We have discussed the reasons: Some issues are introduced in creating a table or updating it when string and varchar values are not correctly quoted when a column is missing and when the column name differs in the CREATE_TABLE UPDATE statement.
You can apply the solution according to your reason for the error.