[amit_27]

IS there any default table mysql server automatically creates and manages these tables like INSERTED, DELETED table in MSSQL, DUAL table in ORACLE.

I have used in mssql a query in trigger for insert operation
declare trg_cursor cursor for select fname from inserted;

In oracle a query in trigger for insert operation
select system.clsyncseq.nextval into synchpointnumber from dual;

like this i need default tables for mysql to fire a same query.

I have written a trigger on table t1 for insert. When inserted a row to t1 my trigger will read the information from INSERTED, DUAL tables in case of MSSQL, ORACLE instead of table t1.
The same thing I need to write for MySQL for INSERT, UPDATE, DELETE operation.
Can you please direct me to achieve this?

[pradeep]

declare trg_cursor cursor FOR SELECT fname

[amit_27]

created table account :

+----------+---------------+------+-----+---------+-------+
| Field    | Type          | Null | Key | Default | Extra |
+----------+---------------+------+-----+---------+-------+
| acct_num | int(11)       | YES  |     | NULL    |       |
| amount   | decimal(10,2) | YES  |     | NULL    |       |
+----------+---------------+------+-----+---------+-------+

If I use (MSSQL type)
declare trg_cursor cursor for select acct_num;

while insert :
mysql> INSERT INTO account (acct_num, amount) VALUES (0, 23);$
ERROR 1054 (42S22): Unknown column 'acct_num' in 'field list'

[pradeep]

declare trg_cursor cursor FOR SELECT acct_num;

You have to specify a table name here

[amit_27]

Exactly, I need to specify the table name here. I was asking for the table name to specify in my query like DUAL, INSERTED, DELETED in ORACLE, MSSQL.

Like INSERTED in MSSQL, DUAL table in ORACLE temporary store the updated, inserted, deleted row whilst and I can get the acct_num of only new, delete, updated row form DUAL table for my transaction.

The same thing I want to achieve using MySQL. But I didn't see any table which

[pradeep]

Dual is available in MySQL as well

SELECT COUNT(*) col FROM dual WHERE 1=0

[amit_27]

Yes, we can use the dual table but not like the Oracle. If we don't have any table reference then we can use dual in MySQL. like for arithmatic operations.

[amit_27]

Thanks pradeep answering my question. I solved the problem.

As MySQL support "For Each Row" mechanisam, we get the directly the output which want using "new" and "old" keyword.

Lke new.acct_num, old.acct_num.

Default table not required and also not available.

[amit_27]

What is the default schema name in MySQL 5.1.34 like in ORACLE is username (system), in MSSQL is "dbo"?


I think it is database name Isn't it?

[amit_27]

what is the default escape character in MySQL?

We have in ORACLE like ' " ', in MSSQL like ' [] ' which is used while creating table.

MSSQL
create table [aa/njh] (col1 INT);

ORACLE
create table "aa/njh" (col1 INT);


If I use both( ", []) in MYSQL while create table it is nor working fine.
My aim is to mhave table name with special character on numeric.