Oracle
PostgreSQLChecking how the AWS Schema Conversion Tool performs conversions. The DDL definitions were borrowed from the AWS Database Migration Playbook. The target was Aurora (PostgreSQL), but the results would be the same for RDS (PostgreSQL).
Oracle
CREATE Statement
CREATE TABLE "DATATYPES"(
"BFILE" BFILE,
"BINARY_FLOAT" BINARY_FLOAT,
"BINARY_DOUBLE" BINARY_DOUBLE,
"BLOB" BLOB,
"CHAR" CHAR(10 BYTE),
"CHARACTER" CHAR(10 BYTE),
"CLOB" CLOB,
"NCLOB" NCLOB,
"DATE" DATE,
"DECIMAL" NUMBER(3,2),
"DEC" NUMBER(3,2),
"DOUBLE_PRECISION" FLOAT(126),
"FLOAT" FLOAT(3),
"INTEGER" NUMBER(*,0),
"INT" NUMBER(*,0),
"INTERVAL_YEAR" INTERVAL YEAR(4) TO MONTH,
"INTERVAL_DAY" INTERVAL DAY(4) TO SECOND(4),
"LONG" LONG,
"NCHAR" NCHAR(10),
"NCHAR_VARYING" NVARCHAR2(10),
"NUMBER" NUMBER(9,9),
"NUMBER1" NUMBER(9,0),
"NUMBER(*)" NUMBER,
"NUMERIC" NUMBER(9,9),
"NVARCHAR2" NVARCHAR2(10),
"RAW" RAW(10),
"REAL" FLOAT(63),
"ROW_ID" ROWID,
"SMALLINT" NUMBER(*,0),
"TIMESTAMP" TIMESTAMP(5),
"TIMESTAMP WITH TIME ZONE" TIMESTAMP(5) WITH TIME ZONE,
"UROWID" UROWID(10),
"VARCHAR" VARCHAR2(10 BYTE),
"VARCHAR2" VARCHAR2(10 BYTE),
"XMLTYPE" "PUBLIC"."XMLTYPE"
);
Table Definition
SQL> desc DATATYPES;
Name Null? Type
----------------------------------------- -------- ----------------------------
BFILE BINARY FILE LOB
BINARY_FLOAT BINARY_FLOAT
BINARY_DOUBLE BINARY_DOUBLE
BLOB BLOB
CHAR CHAR(10)
CHARACTER CHAR(10)
CLOB CLOB
NCLOB NCLOB
DATE DATE
DECIMAL NUMBER(3,2)
DEC NUMBER(3,2)
DOUBLE_PRECISION FLOAT(126)
FLOAT FLOAT(3)
INTEGER NUMBER(38)
INT NUMBER(38)
INTERVAL_YEAR INTERVAL YEAR(4) TO MONTH
INTERVAL_DAY INTERVAL DAY(4) TO SECOND(4)
LONG LONG
NCHAR NCHAR(10)
NCHAR_VARYING NVARCHAR2(10)
NUMBER NUMBER(9,9)
NUMBER1 NUMBER(9)
NUMBER(* ) NUMBER
NUMERIC NUMBER(9,9)
NVARCHAR2 NVARCHAR2(10)
RAW RAW(10)
REAL FLOAT(63)
ROW_ID ROWID
SMALLINT NUMBER(38)
TIMESTAMP TIMESTAMP(5)
TIMESTAMP WITH TIME ZONE TIMESTAMP(5) WITH TIME ZONE
UROWID ROWID
VARCHAR VARCHAR2(10)
VARCHAR2 VARCHAR2(10)
XMLTYPE PUBLIC.XMLTYPE STORAGE BINARY
PostgreSQL
CREATE Statement
CREATE TABLE IF NOT EXISTS datatypes(
bfile CHARACTER VARYING(255),
binary_float REAL,
binary_double DOUBLE PRECISION,
blob BYTEA,
char CHARACTER(10),
character CHARACTER(10),
clob TEXT,
nclob TEXT,
date TIMESTAMP(0) WITHOUT TIME ZONE,
decimal NUMERIC(3,2),
dec NUMERIC(3,2),
double_precision DOUBLE PRECISION,
float DOUBLE PRECISION,
integer NUMERIC(38,0),
int NUMERIC(38,0),
interval_year INTERVAL YEAR TO MONTH,
interval_day INTERVAL DAY TO SECOND(4),
long TEXT,
nchar CHARACTER(10),
nchar_varying CHARACTER VARYING(10),
number NUMERIC(9,9),
number1 NUMERIC(9,0),
"NUMBER(*)" DOUBLE PRECISION,
numeric NUMERIC(9,9),
nvarchar2 CHARACTER VARYING(10),
raw BYTEA,
real DOUBLE PRECISION,
row_id CHARACTER(255),
smallint NUMERIC(38,0),
timestamp TIMESTAMP(5) WITHOUT TIME ZONE,
"TIMESTAMP WITH TIME ZONE" TIMESTAMP(5) WITH TIME ZONE,
urowid CHARACTER VARYING,
varchar CHARACTER VARYING(10),
varchar2 CHARACTER VARYING(10),
xmltype XML
);
Table Definition
postgres> \d datatypes;
+--------------------------+--------------------------------+-------------+
| Column | Type | Modifiers |
|--------------------------+--------------------------------+-------------|
| bfile | character varying(255) | |
| binary_float | real | |
| binary_double | double precision | |
| blob | bytea | |
| char | character(10) | |
| character | character(10) | |
| clob | text | |
| nclob | text | |
| date | timestamp(0) without time zone | |
| decimal | numeric(3,2) | |
| dec | numeric(3,2) | |
| double_precision | double precision | |
| float | double precision | |
| integer | numeric(38,0) | |
| int | numeric(38,0) | |
| interval_year | interval year to month | |
| interval_day | interval day to second(4) | |
| long | text | |
| nchar | character(10) | |
| nchar_varying | character varying(10) | |
| number | numeric(9,9) | |
| number1 | numeric(9,0) | |
| NUMBER(*) | double precision | |
| numeric | numeric(9,9) | |
| nvarchar2 | character varying(10) | |
| raw | bytea | |
| real | double precision | |
| row_id | character(255) | |
| smallint | numeric(38,0) | |
| timestamp | timestamp(5) without time zone | |
| TIMESTAMP WITH TIME ZONE | timestamp(5) with time zone | |
| urowid | character varying | |
| varchar | character varying(10) | |
| varchar2 | character varying(10) | |
| xmltype | xml | |
+--------------------------+--------------------------------+-------------+
The comparison results between Oracle and PostgreSQL are as follows.
Oracle vs PostgreSQL Data Type Comparison
| No. | Oracle (desc result) | PostgreSQL (\d metacommand result) |
|---|---|---|
| 1 | BINARY FILE LOB | character varying(255) |
| 2 | BINARY_FLOAT | real |
| 3 | BINARY_DOUBLE | double precision |
| 4 | BLOB | bytea |
| 5 | CHAR(10) | character(10) |
| 6 | CHAR(10) | character(10) |
| 7 | CLOB | text |
| 8 | NCLOB | text |
| 9 | DATE | timestamp(0) without time zone |
| 10 | NUMBER(3,2) | numeric(3,2) |
| 11 | NUMBER(3,2) | numeric(3,2) |
| 12 | FLOAT(126) | double precision |
| 13 | FLOAT(3) | double precision |
| 14 | NUMBER(38) | numeric(38,0) |
| 15 | NUMBER(38) | numeric(38,0) |
| 16 | INTERVAL YEAR(4) TO MONTH | interval year to month |
| 17 | INTERVAL DAY(4) TO SECOND(4) | interval day to second(4) |
| 18 | LONG | text |
| 19 | NCHAR(10) | character(10) |
| 20 | NVARCHAR2(10) | character varying(10) |
| 21 | NUMBER(9,9) | numeric(9,9) |
| 22 | NUMBER(9) | numeric(9,0) |
| 23 | NUMBER | double precision |
| 24 | NUMBER(9,9) | numeric(9,9) |
| 25 | NVARCHAR2(10) | character varying(10) |
| 26 | RAW(10) | bytea |
| 27 | FLOAT(63) | double precision |
| 28 | ROWID | character(255) |
| 29 | NUMBER(38) | numeric(38,0) |
| 30 | TIMESTAMP(5) | timestamp(5) without time zone |
| 31 | TIMESTAMP(5) WITH TIME ZONE | timestamp(5) with time zone |
| 32 | ROWID | character varying |
| 33 | VARCHAR2(10) | character varying(10) |
| 34 | VARCHAR2(10) | character varying(10) |
| 35 | PUBLIC.XMLTYPE STORAGE BINARY | xml |