select the last value from the database

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Dear All,

How to Select the last value from the sql database.

i have a table with customerId is a Primary key and i want last value show in a textbox.
and next generated primary key(Which is the use in current form) show in other textbox.

Posted 3-Sep-13 20:57pm

Manish Arya

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Thomas ktg 4-Sep-13 3:05am

What do you mean by last value? Is that the last record inserted in the database table or something else?

Manish Arya 4-Sep-13 3:10am

yes last record
means:
customer ID automatic generated like
CustomerId 1
CustomerId 2
CustomerId 3
CustomerId 4
CustomerId 5

now textbox1 =5 and then textbox2=6(which is currently used by the program)

3 solutions

Solution 1

You can have Identity column and get the record based on that column.

C#

SELECT TOP 1 Id FROM table ORDER BY Id DESC

SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record[^]

Posted 3-Sep-13 21:05pm

Thanks7872

Solution 3

you can use this

SQL

Select isnull(max(customerID),0) from mytable

Posted 3-Sep-13 21:20pm

Menon Santosh

Comments

[no name] 4-Sep-13 3:23am

+5....

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OriginalGriff · Accepted Answer · 2013-09-03T21:08:00

Don't. Don't even think about it.
You cannot show "the next generated primary key" because in a multi-user system (and that is the only reason to use SQL) you do not know what the "next" value will be: it depends on what everybody else is doing, and the order in which they do it. Think about it: if you have two users both entering data, then they both will see the "next" value - and it will be the same value. But when they try to submit the data, they can't both use the same primary key without SQL correctly throwing an error. You only ever show a new value after it is used, or allocated at the very least (and then you have the fun of deallocation if they don't complete the operation for whatever reason).

The "last value" is also difficult to show, unless there is some order to the keys, or some field which records the date and time at which it was allocated. Then, all you have to do is

SQL

SELECT TOP 1 customerID FROM MyTable ORDER BY ... DESC

And fill in your sort criteria. If you do not specify an ORDER clause, then SQL is at liberty to return rows in any order it sees fit - it may return the last entered, but it doesn't have to: it can happily return rows in a different order every time you run the same query, if that is more efficient for it.