Multiple table associations update multiple different records at the same time

Source: Internet
Author: User

Because the project requires that multiple different records be updated at the same time, we have discussed a good solution with our colleagues.

The following is a test example.

1. Create two temporary tables and input test data:

View code

 1 create table #temptest1
2 (
3 id int,
4 name1 varchar(50),
5 age int
6 )
8 create table #temptest2
9 (
10 id int,
11 name1 varchar(50),
12 age int
13 )

The following table data is queried:

# Temptest1 # temptest2


2. Now we need to update the age in # temptest2 to the corresponding age in # temptest1.

In fact, the age of Id 1 in [Table 1] is changed to 19, and the age of ID 2 is changed to 20.

Of course, the requirements here are:Use only one SQL statement, and do not use Loops.

The result is as follows:


The implementation method is as follows:

Update T1

Set T1. Age = t2.age

From # temptest1 T1

Join # temptest2 T2

On =


(Supplement) SQL Server 2008 merge command syntax:

Merge into # temptest1 T1
Using (select age, ID from # temptest2) T2
On =
When matched then
Update set t1.age = t2.age


Is it an interesting SQL statement.

There is also a related blog for your reference:☜Tracy☞


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