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I got this error when using GroupBy via LINQ on a MySQL database. The problem was that the anonymous object property that was being used by GroupBy did not match the database column name. Fixed by renaming anonymous property name to match the column name.
10 Νοε 2021 · When you try to insert into a column that doesn’t exist in the table, MySQL will throw the said error: INSERT INTO students(student_name) VALUES (Michael); -- ERROR 1054 (42S22): Unknown column 'student_name' in 'field list'.
18 Οκτ 2023 · The "Error: ambiguous column name: Name" in SQL happens when the same column name is found in multiple tables or parts of a query, making it unclear which one to use. This error is common in various situations, such as joining tables, using subqueries, and creating views.
29 Μαρ 2014 · I want to rename a column from read-more to read_more in my blog table. I tried all this: ALTER TABLE blog RENAME COLUMN read-more to read_more; ALTER TABLE blog CHANGE COLUMN 'read-more' 'read_more' VARCHAR(255) NOT NULL; And I always get this!
1 Οκτ 2014 · 5 Answers. Sorted by: 63. To use AUTO_INCREMENT you need to deifne column as INT or floating-point types, not CHAR. AUTO_INCREMENT use only unsigned value, so it's good to use UNSIGNED as well; CREATE TABLE discussion_topics ( topic_id INT NOT NULL unsigned AUTO_INCREMENT,
2 Οκτ 2021 · The ERROR 1054 in MySQL occurs because MySQL can’t find the column or field you specified in your statement. This error can happen when you execute any valid MySQL statements like a SELECT, INSERT, UPDATE, or ALTER TABLE statement. This tutorial will help you fix the error by adjusting your SQL statements.
2 ημέρες πριν · Fix: Configure SQL modes correctly in the MySQL configuration file (my.cnf or my.ini): ini. [mysqld] sql_mode = "STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO". Setting strict SQL modes enforces rules that prevent division by zero errors, helping maintain data integrity. 6.
