"Operator Does Not Exist: Integer =" When Using Postgres

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

I think it is telling you exactly what is wrong. You cannot compare an integer with a varchar. PostgreSQL is strict and does not do any magic typecasting for you. I'm guessing SQLServer does typecasting automagically (which is a bad thing).

If you want to compare these two different beasts, you will have to cast one to the other using the casting syntax ::.

Something along these lines:

create view view1
as 
select table1.col1,table2.col1,table3.col3
from table1 
inner join
table2 
inner join 
table3
on 
table1.col4::varchar = table2.col5
/* Here col4 of table1 is of "integer" type and col5 of table2 is of type "varchar" */
/* ERROR: operator does not exist: integer = character varying */
....;

Notice the varchar typecasting on the table1.col4.

Also note that typecasting might possibly render your index on that column unusable and has a performance penalty, which is pretty bad. An even better solution would be to see if you can permanently change one of the two column types to match the other one. Literately change your database design.

Or you could create a index on the casted values by using a custom, immutable function which casts the values on the column. But this too may prove suboptimal (but better than live casting).

ERROR: operator does not exist : integer = integer[] when using IN operator in PostgreSQL. Why do I get this error?

The array_agg is useless in this context. It is only significant overhead and in block some possible optimization.

Write just WHERE d IN (SELECT userid ...

Note - when you really need to check if some value is in an array, you should to use operator = ANY(), but this is not this case:

postgres=# SELECT 1 WHERE 1 = ANY(ARRAY[1,2,3]);
┌──────────┐
│ ?column? │
╞══════════╡
│        1 │
└──────────┘
(1 row)

PostgreSQL Error: operator does not exist: name = integer

According to the manual, USER is a reserved keyword. You must quote it to avoid the syntax error.

SELECT * FROM registrants WHERE "user" = 1

PostgreSQL Reserved Keyword List

If you have time to alter the database, change the column name to one which is not a reserved keyword. This will help you avoid future headaches.

PostgresQL ERROR: operator does not exist: integer = integer[]

The = comparator can only compare two values of the same type. But here you are trying to compare an integer value with an array. So the value 1 cannot equal a value that look like [1,2].

You can use the = ANY(...) comparator which checks if the left value is part of the right array:

demo:db<>fiddle

ON session_id = ANY(session_ids)

Postgresql ERROR: operator does not exist: date ~~ unknown

The ~~ operator is actually the LIKE operator.

You are trying to use an expression that looks like:

contenido.field_value_fecha.value LIKE '%aaaa%'

That is, you're trying to compare a date with a string (which, without the adequate context, is considered to be of type 'unknown'), and decide if the date looks like something.

If you actually want to do such a comparison, you need to convert the date to a string, which can be done by means of:

contenido.field_value_fecha.value::text LIKE '%aaaa%'

or (using standard SQL):

CAST(contenido.field_value_fecha.value AS text) LIKE '%aaaa%'

This will be syntactically correct... Whether it is meaningful or not, is a different part of the story.

Postgresql IN error: operator does not exist integer = integer[]

In short: in() needs a list of scalars, while any() needs an array expression.

Per the documentation:

expression IN (value [, ...])

The right-hand side is a parenthesized list of scalar expressions.

Example:

where integerid in (1, 2, 5)

expression operator ANY (array expression)

The right-hand side is a parenthesized expression, which must yield an array value.

Example:

where integerid = any ('{1, 2, 5}');

Because

skill_id_array in Postgres looks like this: {1,2,5}

so when passed to the query the expression is enclosed in single quotes and you can use it with any(). If you do the same with in() you'll obviously get invalid syntax:

where integerid in ('{1, 2, 5}');

ERROR:  invalid input syntax for integer: "{1, 2, 5}"

or, if your ORM uses automatic casting:

where integerid in ('{1, 2, 5}'::int[]);

ERROR:  operator does not exist: integer = integer[]

Django and Postgresql operator does not exist: integer = character varying

You have set a character field (recordname) as the primary key for CachedRecord.

Django created an automatic primary key (of type integer) for CachedRecordData called id - since there is no primary key specified in the model definition.

Now when you try to delete CachedRecord, django is creating a primary key lookup to make sure all related CachedRecordData instances are deleted, and since one key is a character and the other an integer - the database is giving this error.

The easiest way to solve this problem is remove primary_key=True from recordname and let django manage the keys correctly. You can always add an index on that column, or other constraints (for example, set unique=True).

You also have a similar problem here:

def __unicode__(self):
    return self.recordname+":"+self.recordcount

You are adding a string ':' with self.recordcount which will result in a TypeError exception, as you cannot combine a string with a number:

>>> ':'+3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot concatenate 'str' and 'int' objects

To solve this issue:

def __unicode__(self):
    return u'{}:{}'.format(self.recordname, self.recordcount)

operator does not exist: text - unknown

The error message is pretty obvious: your column is defined as text not as jsonb or json. But the ->> operator only works with a jsonb or json column, so you will need to cast it:

SELECT "Price"::jsonb ->> 'TotalPrice' 
FROM "ReadModel"."MyListingDto"

Unrelated to your problem, but: you should really avoid those dreaded quoted identifiers. They are much more trouble than they are worth it.