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 equality operator (=) in a SQL query. The equality operator only works between two values of the same data type, so you cannot compare a string with an integer directly.

To resolve this error, you need to make sure that you are comparing values of the same data type. You can use the CAST or CONVERT function to convert one data type to another before comparing them. For example, if you have a string column named "mycolumn" and an integer value 123, you can convert the integer value to a string and compare it with the string column as follows:

SELECT * FROM mytable WHERE mycolumn = CAST(123 AS VARCHAR);

Alternatively, you can convert the string column to an integer and compare it with the integer value:

SELECT * FROM mytable WHERE CAST(mycolumn AS INTEGER) = 123;

Make sure to choose the appropriate data type conversion function based on the data types of the values you are comparing.