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this is more of a general question I came across today.
To update an sql record I noticed that it is common practice where I work to store the old record values, remove the record, and then add a new record with the old values plus one or more values that have been changed.
Wouldn't it be easier to simply update only the values you want to edit? Or, is there some reason for the entire removal that I'm not seeing?
Thank you.
If you want to update a record, then just update it using update query. It's not a good practice to remove the entire row and inserting back after applying modification instead of an update query.
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I try to understand what I should do when the user will ask to delete his account from the app, but it has a lot of info connected to this user and I should leave it. Is it okay if I just make couple of columns null?
One idea is to have a Status column in your user table and you can make the Status Active or Inactive. You can use Inactive to represent a "deleted" user. This way, any data the user created can remain intact, along with all referential integrity relationships.
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I come to know that this is used to speed up data retrieval..I like to know more about it .Thanks .
Indexing is a way of sorting a number of records on multiple fields. Creating an index on a field in a table creates another data structure which holds the field value, and pointer to the record it relates to. This index structure is then sorted, allowing Binary Searches to be performed on it.
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I Need to track down the records deleted from the tables from a database. Apart from triggers any other way to do it in sql server?
The only way you can do this is to restore the database form a backup and compare the tables, I'd probably go with an EXCEPT query:
select * from restored_db.table
EXCEPT
select * from current_db.table
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I'm using SQL Server DB and I would like to write query which will look for a fields with two or more slashes in it, lets say we have these rows:
1. abc/def/g
2. abcd/efg
3. a/b/c/d/e/f/g
So it should return 1st and 3rd row! What is the easiest way to do so?
Thanks in advance!
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I would like to know if there is another option I can take to avoid using triggers.
I want to insert records into a QUEUE table when a table has changed via (DELETE, INSERT or UPDATE) of a record. The current way I am doing is by using triggers for the target tables.
What are some other options?
If you wanted to avoid triggers, you could revoke direct permissions from the tables and process everything through stored procedures. The procedure would perform the operation as well as the queue entry.