How to Resolve SQL0418N Error

How to resolve SQL0418N Error

Basically, DB2 doesn't know what data types you're sending in on those parameters. I'm guessing you're either on an older version of DB2 (less than 9.7 on Linux/Unix/Windows, or on a Mainframe version older than 10.1), which doesn't do a whole lot of "automatic" type conversion. Or you're sending in NULL values (which still have to be "typed", strange as it sounds).

You can fix the problem by creating your parameter markers as typed parameters (I'm assuming data types here, use what would be appropriate):

MERGE INTO AB.TESTING_TABLE A
USING (VALUES (
          CAST(@TEST AS CHAR(4))
         ,CAST(@ACTION AS CHAR(1))
       )) B(TEST_ID, "ACTION")
   ON (A.TEST_ID = B.TEST_ID)
 WHEN NOT MATCHED THEN
     INSERT (TEST_ID, "ACTION")
     VALUES (B.TEST_ID, B.ACTION)
WHEN MATCHED THEN
     UPDATE SET "ACTION" = B.ACTION

Additionally, since you're using the MERGE, you don't have to use parameters in the UPDATE or INSERT parts, you can refer to the values in the USING table you passed in. Also, since you're matching on TEST_ID, you don't need to include that in your UPDATE statement, since it wouldn't be updated, anyway.

NamedJdbcParameterTemplate : -418 SQL error with setting Date

Try changing DATE(:myDate) to CAST(:myDate AS DATE). Sometimes DB2 is very peculiar about having "untyped" parameters (even when you're explicitly casting it here with the DATE function).

Have a look at this other answer I have on -418.

Do a DB2 insert with a select and parameters

You need to type-cast your parameter marker so DB2 knows what to expect.

For example:

INSERT INTO TABLEA
(
 COLUMN1, COLUMN2, COLUMN 3
)
SELECT FOOBAR, DOOBAR, cast(? as int)
FROM TABLEB

Obviously, cast to the appropriate type -- int is just an example.

iDB2 Select command with parameters returning SQL0418

AFAIK, this is a platform limitation. that can be confirmed by an explanation that the platform adds to the application exception*. That being said, as I can't change the parameters I receive and don't have access to the info they are going to held in the query, the best solution to my specific problem is to do a CAST to the types that the TIMESTAMP scalar function uses, e.g.:

SELECT TIMESTAMP(cast(@param0 as DATE),cast(@param1 as TIME)) FROM SYSIBM.SYSDUMMY1

DB2: invalid use of one of the following: an untyped parameter marker, the DEFAULT keyword, or a null value

As you mentioned in your comment, DB2 is really picky about data types, and it wants you to cast your variables into the right data types. Even if you are passing in NULLs, sometimes DB2 wants you to cast the NULL to the data type of the target column.

Here is another answer I have on the topic.

DB2 SQL - Unresolved Untyped Expression Error with PreparedStatement

Try using CAST or DATE() to tell the compiler the expected type, example:

SELECT CUSTOMER, MAX(TRANSACTION_COUNT) as UNIT_COUNT, DATE(:date) as EVENT_DATE, 'XYZ File Transfer' as TYPE, 'Financial Report' as EVENT 
FROM  REPORT_TABLE RT  
WHERE upper(REPORT_STATUS) = 'READY' and TRUNC(CREATED_TS) = CAST(:date as DATE) and TRANSACTION_COUNT > 0 
GROUP BY CUSTOMER

db2_prepare(): Statement Prepare Failed when binding parameter

As mentioned in the comment, I'm guessing that your problem is that DB2 cannot determine what type your parameter is when it's doing the binding. If you add a CAST around the parameter to tell DB2 what type you are passing, it should work.

I'm not sure if PHP has an option, but in C#, you can pass in the type when defining the parameter, so that might be an option, if it's available, instead of hard-coding the type in SQL.

Check out this other answer I have about how to fetch the "native" DB2 errors, which are likely much more helpful than the ones thrown by PHP. I also have another answer about SQL0418N, which is probably the actual error you would have received if you were looking at the native error.

DB2 Query Functions Not Working With Parameters

As @Mustaccio pointed out in the comments, casting as a CHAR is the equivalent to CHAR(1). I corrected this to declare an actual length and the query is working.

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