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Not sure it is possible, but I am trying to import a large set of data and I want to make the cases for certain fields to be imported as all lowercase. I know how to do it once the data is loaded but it takes forever so was looking to do it as I imported it.
Thanks
Create a database trigger which will ensure that all characters are coverted to lowercase before storing in a particular filed
CREATE TRIGGER lc_ins BEFORE INSERT ON tablename FOR EACH ROW
SET NEW.fieldname = LOWER(NEW.fieldname);
CREATE TRIGGER lc_upd BEFORE UPDATE ON tablename FOR EACH ROW
SET NEW.fieldname = LOWER(NEW.fieldname);
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Can we directly insert into any specific cell in mySQl, not in a whole column or whole row?
I tried using mySQL.connector to insert a listoftime in one python script at time column of details table and listofcamera in another python file at column camera of details table. But i want them to be right next to each other.enter image description here
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I have a mysqlp table which contains a set of data as in the sample excel file. We need a query that will copy the product name into the customer field where customer = Luxury. We used the below query to start editing one by one but there are thousands of records.
SET customer = 'TAVERNAKI' WHERE product = 'TAVERNAKI' AND customer = 'LUXURY';
So we are going about copying and pasting the query and replacing the product name each time. Does anyone have an idea for a mass edit of all records?
Sample file in the link here
[1]: https://docs.google.com/spreadsheets/d/1sgtwNobMU5mKCLuxDLqhpEivEekI0l4R/edit?usp=sharing&ouid=107367920163394089177&rtpof=true&sd=true
Simply
UPDATE table SET customer=product WHERE customer='Luxury'
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I have millions of data in my database table customer. In that, I have the id_token attribute which has value like cus00001 format now I want to change it to ank00001.
What will be the query in rails or mysql to do it for all the data in the database?
You can use simple update query using REPLACE function:
UPDATE `table_name` SET `id_token` = REPLACE(`id_token`, 'ank', 'cus');
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How can I deactivate a row instead of deleting it, using flag values in MySQL?
Add an active column to the table, and then do:
UPDATE YourTable
SET active = 0
WHERE id = :id
to deactivate the row. You'll then need to update all other queries so they do:
WHERE active = 1
There's no built-in mechanism that does this automatically.
You can create a column in your table as type CHARACTER(1), and use something like 'A' for active and 'D' for deactivated.
There isn't a "flag value" for mysql, people refer to it as a flag, as they created the flag within their own tables for use as such.
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I have on before trigger. Lets say i insert a row. Is it posible to insert another row in the trigger into the same table so there are 2 total rows inserted?
If it is on the same table, the answer is a big NO.
If you want to add another duplicate row, it would cause a circular invocation of BEFORE trigger. Circular operations on the same table are not allowed in a trigger.
You can only add a new row to another table but not in the same table.
Refer to: MySQL: Triggers