Oracle SQL Update a table with data from another table

Question

Table 1:

id    name    desc
-----------------------
1     a       abc
2     b       def
3     c       adf

Table 2:

id    name    desc
-----------------------
1     x       123
2     y       345

In prophet SQL, how would I run a sql update question that can refresh Table 1 with Table 2's name and desc utilizing a similar id? So the final product I would get is:

Table 1:

id    name    desc
-----------------------
1     x       123
2     y       345
3     c       adf

Answer 1

This is called a correlated update:

UPDATE table1 t1
   SET (name, desc) = (SELECT t2.name, t2.desc
                         FROM table2 t2
                        WHERE t1.id = t2.id)
 WHERE EXISTS (
    SELECT 1
      FROM table2 t2
     WHERE t1.id = t2.id )

You may alternatively, assuming the join produces a key-preserved view

UPDATE (SELECT t1.id, 
               t1.name name1,
               t1.desc desc1,
               t2.name name2,
               t2.desc desc2
          FROM table1 t1,
               table2 t2
         WHERE t1.id = t2.id)
   SET name1 = name2,
       desc1 = desc2

I hope this helps you.

Answer 2

MERGE INTO Table1 t1 

 using Table2 t2

on(t1.id=t2.id)

WHEN MATCHED THEN

   update set t1.name=t2.name,t1.desc=t2.desc;