Phpworker posted

MySQL error : Every derived table must have its own alias

query


select some_field + other_field as d from (select * form subquery )

i got Error :


 Every derived table must have its own alias

Edit Question

noob
answered Apr 25 '23 00:00

In MySQL, a derived table is a table that is created from a subquery in a larger SQL statement. When creating a derived table, it's mandatory to provide an alias for the table, which is used to reference it in the rest of the SQL statement.

The error "Every derived table must have its own alias" occurs when a derived table in a SQL statement doesn't have an alias specified.

To fix this error, you need to add an alias for the derived table. Consider the following example:

S


ELECT *
FROM (
  SELECT column1, column2
  FROM table1
  WHERE column3 = 'value'
) AS dt

In this example, the subquery creates a derived table that is given the alias "dt". The outer query then selects all columns from this derived table using the specified alias.

By providing an alias for the derived table, you can avoid the "Every derived table must have its own alias" error and ensure that your SQL statement executes correctly.

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Phpworker posted

MySQL error : Every derived table must have its own alias

noob answered Apr 25 '23 00:00

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noob
answered Apr 25 '23 00:00