I want to insert a row if the field 'Rem' is yes. I am using triggers. Here the issue is I want to insert the data in the same table. Could you please let me know if you have come across this scenario?
Example:
create table Table1
(
id int,
name varchar(100),
is_rem varchar(20)
);
create or replace trigger Table1Trigger
after insert
on Table1
for each row
when (new.is_rem ='yes')
begin
insert into Table1 (id, name, is_rem)
values (:new.id, :new.name, :new.is_rem);
end; /
If I am inserting the is_rem as yes, the table should have two rows of the same data.
Below should works in MySQL
create table if not exists Table1 ( id int, name varchar(100), is_rem varchar(20) );
insert into Table1
select new_id as id, new_name as name, new_is_rem as is_rem
from Table2 where new_is_rem = 'yes';
Related
If I run the following select statement inside an insert trigger, is it possible that it will return more than one result?:
DECLARE #variable char(1) = (SELECT ID FROM inserted)
If so, then what's the best to handle it?
Here is the problem that I am trying to solve: Every time when the new record is inserted into a table, I want to take the newly inserted ID and insert it into another table(if it doesn't exists).
Thank you!
Instead of
DECLARE #variable char(1) = (SELECT ID FROM inserted)
You can do something like following:
Declare #VarTempTbl as table (id int)
Insert into #VarTempTbl (id)
Select id from inserted
So that you can get those values for further processing
Now, I had created Two tables One for Master table and another for When any Insertion happens in that Master table, that entry has to inserted into the another table.
CREATE TABLE tblEmployee
(
Id int Primary Key,
Name nvarchar(30),
Gender nvarchar(10),
DepartmentId int
)
CREATE TABLE tblEmployee_New
(
Id int Primary Key,
Name nvarchar(30),
Gender nvarchar(10),
DepartmentId int
)
Trigger:
CREATE TRIGGER TR_EMPLOYEEDETAILS_AFTEROFINSERT
ON TBLEMPLOYEE
AFTER INSERT
AS
BEGIN
TRUNCATE TABLE tblEmployee_New
INSERT INTO TBLEMPLOYEE_NEW(ID, NAME, GENDER, DEPARTMENTID)
SELECT ID, NAME, GENDER, DEPARTMENTID
FROM INSERTED
END
Now Lets try to insert into record into a master table
Insert into tblEmployee values (1,'John', 'Male', 3)
Insert into tblEmployee values (2,'Mike', 'Male', 2)
It has automatically insert the newly inserted records into the another table.
If your want to remove the Previous records then add a drop Statement in that above Trigger.
Note: You can also use #Temp Table instead of creating a another table('tblEmployee_New')
Kinldy Share your comments
I have two tables
CREATE TABLE Temp_1
(
ID Int IDENTITY(1,1),
Name Varchar(500)
)
CREATE TABLE Temp_2
(
ID Int IDENTITY(1,1),
Name Varchar(500)
)
INSERT INTO Temp_1
SELECT 'CC'
INSERT INTO Temp_2
SELECT Name
FROM Temp_1
WHERE 2 = 1
There is no insertion into the table Temp_2.So my expected output for the SCOPE_IDENTITY () for the table Temp_2 is NULL.
How can i get the Identity Value of the Temp_2 as null?
If we use the SCOPE_IDENTITY() OR ##IDENTITY, the identity value we are getting is only of the table Temp_1. We need to get the identity value of table Temp_2 which is "null" as there is no insertion in the table Temp_2 .
Neither. You want to use the output clause:
DECLARE #ids TABLE (id INT);
INSERT INTO Temp_1
OUTPUT inserted.id INTO #ids
SELECT 'CC' ;
This is session-safe, statement-safe, multi-threaded safe. And it allows you to handle multiple row inserts. And it allows you to return additional columns.
There is no reason to use any other method.
I want to add a row to an Informix database table, but when a row exists with the same unique key I want to update the row.
I have found a solution for MySQL here which is as follows but I need it for Informix:
INSERT INTO table (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE name="A", age=19
You probably should use the MERGE statement.
Given a suitable table:
create table table (id serial not null primary key, name varchar(20) not null, age integer not null);
this SQL works:
MERGE INTO table AS dst
USING (SELECT 1 AS id, 'A' AS name, 19 AS age
FROM sysmaster:'informix'.sysdual
) AS src
ON dst.id = src.id
WHEN NOT MATCHED THEN INSERT (dst.id, dst.name, dst.age)
VALUES (src.id, src.name, src.age)
WHEN MATCHED THEN UPDATE SET dst.name = src.name, dst.age = src.age
Informix has interesting rules allowing the use of keywords as identifiers without needing double quotes (indeed, unless you have DELIMIDENT set in the environment, double quotes are simply an alternative to single quotes around strings).
You can try the same behavior using the MERGE statement:
Example, creation of the target table:
CREATE TABLE target
(
id SERIAL PRIMARY KEY CONSTRAINT pk_tst,
name CHAR(1),
age SMALLINT
);
Create a temporary source table and insert the record you want:
CREATE TEMP TABLE source
(
id INT,
name CHAR(1),
age SMALLINT
) WITH NO LOG;
INSERT INTO source (id, name, age) VALUES (1, 'A', 19);
The MERGE would be:
MERGE INTO target AS t
USING source AS s ON t.id = s.id
WHEN MATCHED THEN
UPDATE
SET t.name = s.name, t.age = s.age
WHEN NOT MATCHED THEN
INSERT (id, name, age)
VALUES (s.id, s.name, s.age);
You'll see that the record was inserted then you can:
UPDATE source
SET age = 20
WHERE id = 1;
And test the MERGE again.
Another way to do it is create a stored procedure, basically you will do the INSERT statement and check the SQL error code, if it's -100 you go for the UPDATE.
Something like:
CREATE PROCEDURE sp_insrt_target(v_id INT, v_name CHAR(1), v_age SMALLINT)
ON EXCEPTION IN (-100)
UPDATE target
SET name = v_name, age = v_age
WHERE id = v_id;
END EXCEPTION
INSERT INTO target VALUES (v_id, v_name, v_age);
END PROCEDURE;
Hi I am newbie to SQL trigger. since I tried and searched on online and I dont find any clear outcome.
so here is my problem.
I have three tables:
TABLE1 :
ID NAME (columns )
1 prabhu
TABLE2 :
Id COUNTRY (columns )
1 India
I want this to send to log table if anything like insert/update happen in table2
The SQL(DB2) trigger has to do the following and the result should be in log table like this
LOGTABLE:
ID NAME COUNTRY
1 prabhu India
Your help really appreciated.
Try this,
-- Create tables
create table table1(id int, empName varchar(20));
create table table2(id int, country varchar(20));
create table logtable(id int, empName varchar(20), country varchar(20));
-- Create trigger
CREATE TRIGGER logtableAfterInsert ON table2
after INSERT,DELETE,UPDATE
AS
BEGIN
declare #empid int;
declare #empname2 varchar(20);
declare #empcountry varchar(20);
select #empid=i.id from inserted i;
select #empcountry=i.country from inserted i;
select #empname2=tbl1.empName from table1 tbl1 where tbl1.id=#empid;
insert into logtable values(#empid,#empname2,#empcountry);
PRINT 'Inserted'
END
GO
After that insert the values,
insert into table1 values(1, 'prabhu');
insert into table2 values (1, 'India');
Check the results,
select * from table1;
select * from table2;
select * from logtable;
Hope this resolves...
BTW, You need to add the foreign key constraint.
CREATE OR REPLACE TRIGGER logtableAfterUpdate
AFTER UPDATE ON table2
REFERENCING NEW AS NAUDIT OLD AS OAUDIT
FOR EACH ROW MODE DB2SQL
--BEGIN --ATOMIC
insert into logtable
values(
(select id from table2 tbl2 where tbl2.id =OAUDIT.id),
(select empName from table1 tbl1 where tbl1.id=(select id from table2 tbl2 where tbl2.id =OAUDIT.id)),
(select country from table2 tbl2 where tbl2.id =OAUDIT.id)
);
--END;
I have two table Table1 and Table2 and structure of table as
Table1
Primary Key | Name
Table2
Primary Key | Table1_Id_pk | Status - true/false value
When I insert data into Table2 I want to automatically transfer that data in table1 from Table2 which have Status false.
You can create AFTER INSERT trigger:
CREATE TRIGGER DataMigration
ON Table2
AFTER INSERT
AS
BEGIN
INSERT INTO Table1
SELECT *
FROM TAble2
WHERe Status = 'false'
END
GO
Check this example, use ##identity to get inserted row-id and use that id for child table.
declare #t1 table (pk int identity(1,1) not null , name varchar(50) )
declare #t2 table (pk int identity(1,1) not null , t1pk int, status bit )
declare #new_table1Id int
insert into #t1 values( 'ajay')
set #new_table1Id = ##IDENTITY -This gives you last inserted id of #t1
insert into #t2 values( #new_table1Id , 0)
select * from #t1
select * from #t2
##IDENTITY official documentation