What's wrong with this clause?

[Dan Weissmann]

Hi all.

I'm trying to update a column in table one with the values in table 2. Seems
simple, but nothing is being updated. What am I missing?

UPDATE <table1> SET <column1> = <column1> FROM <table1> T1, <table2> T2
WHERE T1.Columnx = T2.columnx

There are values in <table2.column1.> but no values in <table1.column1>.
After the UPDATE is run, there are still no values in <table1.column1>

Thanks,

Dan