Dynamic T-SQL Query Creates Table At Run Time.

The following are the output lines from my code which is constructing some T-SQL queries on the fly. The query highlighted in yellow is the problem query. The code upto the problem query is working correctly and I am able to see the output tables in the Query Analyzer


STEP 1 : Create 3 Tables In Dynamic T-SQL : Showing 3 Strings from Exec statement

Create Table ##Test_word28July2007185548990201 ( t float, e float, s float, word varchar(80) )
Create Table ##OUT_Test_word28July2007185548990201 ( t float, e float, s float, word varchar(80), KeywordID int, rank float )
Create Table ##STVR_FLOAT_Test_word28July2007185548990201 ( var_val float)


Step 2: Retrieving A Value Into Another Global Table (table has only 1 row and 1 column)
Insert Into ##STVR_FLOAT_Test_word28July2007185548990201 ( var_val ) Select IsNull( t , 0 ) from ##Test_word28July2007185548990201
(1 row(s) affected)

Step 3: I need the value (var_val) in ##STVR_FLOAT_Test_word28July2007185548990201
Update ##Out_Test_word28July2007194827580759 Set t = Select var_val from ##STVR_FLOAT_Test_word28July2007194827580759 where t > Select var_val from ##STVR_FLOAT_Test_word28July2007194827580759
Server: Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'Select'.
Server: Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'Select'.
(1 row(s) affected)



Problem Definition

Part 1

The update query is trying to retrieve a value in a dynamically constructed table. ##STVR_FLOAT_Test_word28July2007185548990201 (1 column var_val , 1 row)

Update <Table_Name> set t = @var_val where t > @var_val
The update query is simple, except I need to "SELECT" @var_val from the dynamic table


The @var_val is a float value.

I have outputted the contents of the table that is holding the @temp_val variable
It has the correct value and the table has only 1 row and 1 column.

WHAT IS THE SYNTAX OF A QUERY TO SELECT A SINGLE VALUE FROM A TEMP TABLE WITH ONLY 1 ROW OR COLUMN AND USE THE SELECTED VALUE AS A VARIABLE IN AN UPDATE STATEMENT