T-SQL : Sweet and Sour

I have working on SQL server 2005 (t-sql) lately. This blog is a comparison between the pl/sql features available in t-sql,db2 v 8.2 and oracle 9i pl/sql.
This blog will be updated when anything new turns up.
So here goes...

# Feature Available in SQL server 2005? DB2 Oracle 1 Exception handling Yes. yes yes 2 Transaction Yes. yes yes 3 ELSIF construct No yes yes 4 IF exists () Yes. yes no 5 Max column size 32000 32000 4000 6 Implicit Cursor No Yes Yes 7 Recursive query Yes. Similar to db2 but only 100 literations yes yes : using connect byprior 8 Print Command Yes No Yes 9 Dynamic SQL Yes Yes Yes 10 Dynamic SQL STRING DATATYPE nvarchar and nchar varchar varchar 11 Variable and cursor name same yes yes no 12 Default value while variable declaration no yes yes 13 Sequences No Yes yes

CLOB Datatype

Ah!! The first Tech Post...
Some time back, i had tried out some things to get the features of the CLOB datatype in DB2.
I will share the details, so that you guys need not spend more time on it if in some point of time you need to find the features of CLOB.
Some of the features are w.r.t storing a procedure text in a clob variable.

Features Of CLOB Variables

No Parameter Supports
1 Size upto 2GB - 1 byte

2 Logging Yes

3 Reading Directly from disk. Buffer Pool Not Used.

4 Execute immediate
of DMLs specified in
CLOB Yes
[Code]
CREATE PROCEDURE GTT_CORE.CLOB_TEST
LANGUAGE SQL
BEGIN
DECLARE V_CLOB CLOB;

SET V_CLOB ='INSERT INTO GTT_CORE.DUMMY VALUES(1)';
EXECUTE IMMEDIATE V_CLOB;

END

5 Compilation of Procedure
as dynamic statement Yes
[Code]
BEGIN
DECLARE V_CLOB CLOB;

SET V_CLOB =
'Create procedure GTT_CORE.PROC
LANGUAGE SQL
BEGIN
DECLARE V_COUNT INTEGER;
SELECT COUNT(1) INTO V_COUNT FROM GTT_CORE.DUMMY;
INSERT INTO GTT_CORE.DUMMY VALUES (V_COUNT);
END';
EXECUTE IMMEDIATE V_CLOB;

END


6 Indentation of procedure Yes

7 Global Temporary Table

With a CLOB column NO. DB2 SQL error: SQLCODE: -350, SQLSTATE: 42962,SQLERRMC: V
Message: LOB, DATALINK, or structured type column ""V"" cannot be used in an index, a key, a unique constraint, a functional dependency, a generated column, or a declared temporary table.

[Code]
DROP PROCEDURE GTT_CORE.CLOB_TEST
GO
CREATE PROCEDURE GTT_CORE.CLOB_TEST
LANGUAGE SQL
BEGIN
DECLARE V_CLOB CLOB;
declare GLOBAL TEMPORARY TABLE DUMMY_CLOB (V CLOB) ON COMMIT PRESERVE ROWS NOT LOGGED WITH REPLACE;
SET V_CLOB =
'Create procedure GTT_CORE.PROC
LANGUAGE SQL
BEGIN
DECLARE V_COUNT INTEGER;';
SET V_CLOB = V_CLOB||'
SELECT COUNT(1)
INTO V_COUNT
FROM GTT_CORE.DUMMY;

INSERT INTO GTT_CORE.DUMMY VALUES (V_COUNT);
END';

insert into SESSION.DUMMY_CLOB values(v_clob);

END

8 Storage of CLOB in a table.
Is it with indentation?? Yes
[Code]
DROP PROCEDURE GTT_CORE.CLOB_TEST
GO
CREATE PROCEDURE GTT_CORE.CLOB_TEST
LANGUAGE SQL
BEGIN
DECLARE V_CLOB CLOB;

SET V_CLOB =
'Create procedure GTT_CORE.PROC
LANGUAGE SQL
BEGIN
DECLARE V_COUNT INTEGER;';
SET V_CLOB = V_CLOB||'
SELECT COUNT(1)
INTO V_COUNT
FROM GTT_CORE.DUMMY;

INSERT INTO GTT_CORE.DUMMY VALUES (V_COUNT);
END';

insert into gtt_core.dummy1 values(v_clob);


END


Hope it will be useful someday

-- Rahul Nair