SnowConvert AI - Oracle - Rowid Data Type¶

Description¶

Each row in the database has an address. (Oracle SQL Language Reference Rowid Data Types)

ROWID DataType¶

Description¶

The rows in heap-organized tables that are native to Oracle Database have row addresses called rowids. You can examine a rowid row address by querying the pseudocolumn ROWID. Values of this pseudocolumn are strings representing the address of each row. These strings have the data type ROWID. You can also create tables and clusters that contain actual columns having the ROWID data type. (Oracle SQL Language Reference ROWID Data Types)

ROWID

Sample Source Patterns¶

ROWID in Create Table¶

Oracle¶

CREATE TABLE rowid_table
(
    rowid_column ROWID
);

Snowflake¶

CREATE OR REPLACE TABLE rowid_table
    (
        rowid_column VARCHAR(18) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - ROWID DATA TYPE CONVERTED TO VARCHAR ***/!!!
    )
    COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
    ;

Insert data in the ROWID column¶

It is possible to insert data in ROWID columns if the insert has a valid ROWID, as shown in the example below. Unfortunately retrieving ROWID from a table is not allowed.

Oracle¶

INSERT INTO rowid_table VALUES ('AAATtCAAMAAAADLABD');

SELECT rowid_column FROM rowid_table;

Result¶

Snowflake¶

INSERT INTO rowid_table
VALUES ('AAATtCAAMAAAADLABD');

SELECT rowid_column FROM
rowid_table;

Result¶

Known Issues¶

1. Retrieving ROWID from a table that does not have an explicit column with this data type

As mentioned in the Snowflake forum, ROWID is not supported by Snowflake. The following query displays an error in Snowflake since hr.employees do not contain a ROWID column.

Oracle¶

SELECT
    ROWID
FROM
    hr.employees
FETCH NEXT 10 ROWS ONLY;

Result¶

Snowflake¶

SELECT
    --** SSC-FDM-OR0030 - ROWID PSEUDOCOLUMN IS NOT SUPPORTED IN SNOWFLAKE, IT WAS CONVERTED TO NULL TO AVOID RUNTIME ERRORS **
    '' AS ROWID
FROM
    hr.employees
FETCH NEXT 10 ROWS ONLY;

Result¶

Related EWIs¶

1. SSC-EWI-0036: Data type converted to another data type.
2. SSC-FDM-OR0030: ROWID pseudocolumn is not supported in Snowflake.

UROWID Data Type¶

Description¶

Oracle uses universal rowids (urowids) to store the addresses of index-organized and foreign tables. Index-organized tables have logical urowids and foreign tables have foreign urowids.(Oracle SQL Language Reference UROWID Data Type)

UROWID [(size)]

Sample Source Patterns¶

UROWID in Create Table¶

Oracle¶

CREATE TABLE urowid_table
(
    urowid_column UROWID,
    urowid_sized_column UROWID(40)
);

Snowflake¶

CREATE OR REPLACE TABLE urowid_table
    (
        urowid_column VARCHAR(18) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - UROWID DATA TYPE CONVERTED TO VARCHAR ***/!!!,
        urowid_sized_column VARCHAR(18) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - UROWID DATA TYPE CONVERTED TO VARCHAR ***/!!!
    )
    COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
    ;

Insert data in the UROWID column¶

Just like ROWID, it is possible to insert data in UROWID columns if the insert has a valid UROWID, but retrieving from a table is not allowed.

Oracle¶

INSERT INTO urowid_table VALUES ('*BAMAAJMCVUv+','*BAMAAJMCVUv+');

SELECT * FROM urowid_table;

Result¶

Snowflake** SSC-FDM-0007 - MISSING DEPENDENT OBJECT “urowid_table” **¶

INSERT INTO urowid_table
VALUES ('*BAMAAJMCVUv+','*BAMAAJMCVUv+');

SELECT * FROM
urowid_table;

Result¶

Known Issues¶

1. Retrieving UROWID from a table that does not have an explicit column with this data type

The following query displays an error in Snowflake since hr.countries do not contain a ROWID (as mentioned in Oracle’s documentation UROWID is accessed with SELECT … ROWID statement) column.

Oracle¶

SELECT
    rowid,
    country_name
FROM
    hr.countries FETCH NEXT 10 ROWS ONLY;

Result¶

Snowflake¶

SELECT
        --** SSC-FDM-OR0030 - ROWID PSEUDOCOLUMN IS NOT SUPPORTED IN SNOWFLAKE, IT WAS CONVERTED TO NULL TO AVOID RUNTIME ERRORS **
        '' AS rowid,
        country_name
FROM
        hr.countries
FETCH NEXT 10 ROWS ONLY;

Result¶

2. EWI should be displayed by SnowConvert AI¶

EWI should be displayed when trying to select UROWID column. There is a work item to add the corresponding EWI.

Related EWIs¶

1. SSC-EWI-0036: Data type converted to another data type.
2. SSC-FDM-OR0030: ROWID pseudocolumn is not supported in Snowflake.