ERROR: operator does not exist: character varying = integer

This error occurs when trying to compare or operate on two values of different data types. In this case, it is trying to compare a string (character varying) with an integer.

For example, if you have a table with a column "name" which is of type string and you try to compare it with an integer value like 5, you will get this error.

To fix this error, make sure you are comparing two values of the same data type. If you need to compare a string with an integer, you can convert the integer to a string using the CAST function. For example, CAST(5 AS VARCHAR) will convert the integer value 5 to a string value "5".

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"ERROR: operator does not exist: character varying = integer

This error occurs when you try to compare a string (character varying) with an integer using the equal (=) operator. It means that the two data types are not compatible for comparison.

For example, let's say you have a table with a column named "age" of type integer, and you want to filter the results to only show records where the age is equal to a certain value. If you mistakenly write the query like this:

SELECT * FROM my_table WHERE age = '25';

You will get the "ERROR: operator does not exist: character varying = integer" error because you are trying to compare an integer column with a string value ('25').

To fix this error, make sure that you are comparing values of the same data type. In the above example, you should use an integer value instead of a string value:

SELECT * FROM my_table WHERE age = 25;

Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: character varying = integer

这个错误通常是因为在 PostgreSQL 数据库中，你尝试使用 "varchar" 类型的字段和 "integer" 类型的字段进行比较，而这两种类型的数据是不能直接比较的。

你可以尝试将其中一个字段的类型转换为与另一个字段相同的类型，或者使用一个转换函数来将它们转换为相同的类型，例如：

SELECT * FROM your_table WHERE varchar_field = CAST(integer_field AS varchar);

或者：

SELECT * FROM your_table WHERE varchar_field = to_char(integer_field, '999');

这两种方法都将 "integer" 类型的字段转换为 "varchar" 类型的字段，以便进行比较。