I create a table and after inserting a new column with help of alter command.
now I want to add different data in each row of that column
can I able to do that?
I used insert command but it will add a new row and
with update command I have to write queries for every single row.
can I do it with a single query ?
I am running MySQL 5.6. I want to know which row/rows have been updated in a table. One way is to create a trigger using PHPMyAdmin. This trigger can store row id (id is be a table column) of that row and current datetime into another table. This way I will know which record has changed. In PhpMyAdmin when I add trigger it asks me event, time and table which I filled. But what do I write in Definition & Definer.
I'm running MySQL 5.6 and I have two databases. When a record is inserted into the table of one database, I want to insert that row into the same table in the other database. I have this working properly.
My question, is there a shorthand reference to just insert the whole new row into the other database's table. Short-hand so I don't have to write all the column names and VALUES(). I'd like to simplify the trigger so that when I update the table (add/remove/rename columns), I don't need to update the Trigger's SQL code too.
Something like this (this won't work, but gets the point across), that copies the new row from database "abc" to database "def"
CREATE TRIGGER abc.users_insert_trigger
AFTER INSERT
ON abc.users FOR EACH ROW
INSERT INTO def.users NEW;
I have on column rais_date in one table in let test and i want to map this column with it's transaction table column let rais_trans_date. in mysql is it is possible.
Means all the value of rais_date automatically copy to rais_trans_date, either add or update in master table column i.e. rais_date.
if yes please suggest me how..
You can use MySql Triggers to do this...
CREATE TRIGGER ` BEFORE INSERT ONTableName` FOR EACH ROW BEGIN
-- Your Logic Goes here
END
I want to add a new column to a table in MySQL database that should get the value of another column in the same table. Is this possible? If so, how do you do it?
Starting with MySQL 5.0.2 you can write a stored procedure linked to a TRIGGER which can examine the new column each time a row is inserted, and automatically copy the other column's value into the new column if no value was supplied for the new column.
You Can use this following two command to do your work.
This command will be used to add new column in you table. Remember data type from where you want to copy to use those data type in new Column.
ALTER TABLE table_name ADD new_column_name VARCHAR(60);
2: This command to copy data from old column name to new column name.
UPDATE table_name SET new_column_name = old_column_name;
Then if you want to delete previous column, Then you can use following command
ALTER TABLE table_name DROP COLUMN old_column_name;
As of 20101212 mysql does not support defaulting 2 timestamp columns, which means you can't do a 'created' and 'updated' on the same table.
If this is what you were trying to do, then the trigger with the stored proc is the way to go.
create a view, and you can select the same column twice and give it different name, then the application can use the view instead use the table directly.