Need to get identify all tables and columns in a SQL Query I have a massive task to go through hundreds of SQL scripts and identify the Table and Columns in each query as we are updating our system and some of the columns and tables may be renamed or disappear completely. 

Is there any product of script that anyone can recommend that will allow me to do this, taking into consideration that whatever program/script is used will need to take into account alias as well as ensuring that it can differentiate between blocks of select code or union.

I have hundreds of queries being used for reports. I need to go through each query and identify tables and columns that are being used within each query.
not "ready to use" solution, but may be is what You need:
http://www.sqlparser.com

description

as I explain in comment, this is framework, it not ready to use solution, but it has very good set of code examples, as well as live-demo.

Live demo

USE [Audit]
GO
ALTER PROCEDURE [dbo].[ReportData3] 
    -- Add the parameters for the stored procedure here
    @PERNR int,
    @PERID int,
    @SNAME int,
    @DateSt date,
    @DateFin date,
    @GROSS_PAY bit

AS
BEGIN
    SET NOCOUNT ON;

IF @GROSS_PAY = 0

   IF @PERNR IS NOT NULL
   SELECT        PERNR, SNAME, WEEK_BEGIN_DATE, PERID, PLSTX, STLX, VDSK1_TEXT, HIRE_DATE, 
                       WEEK_ENDING_DATE, WOSTD, HR_REG, REG_PAY, HR_HOL, HOL_PAY, HR_VAC, VAC_PAY, HR_SIC, SIC_PAY, HR_OVT, OVT_PAY, HR_PRE, PRE_PAY, HR_OTH, 
                       OTH_PAY, HR_TOT_WORKED, HR_STR, STR_PAY, HR_TOT, TOT_PAY, Subtotal, RATR_OF_PAY_HORLY, RATR_OF_PAY_WEEKLY, GROSS_PAY, PAYDT, 
                       AVG_STRAIGHT, AVG_TOTAL, AVG_GROSS, RESULT, SEQNR, TERMDT
   FROM            data_hist
   WHERE WEEK_ENDING_DATE &gt;= @DateSt AND WEEK_ENDING_DATE &lt;= @DateFin and 


-- DELETED 118 rows of code

Result of parsing:

Tables:
data_hist
Fields:
data_hist.AVG_GROSS
data_hist.AVG_STRAIGHT
data_hist.AVG_TOTAL
data_hist.GROSS_PAY
data_hist.HIRE_DATE
data_hist.HOL_PAY
data_hist.HR_HOL
data_hist.HR_OTH
data_hist.HR_OVT
data_hist.HR_PRE
data_hist.HR_REG
data_hist.HR_SIC
data_hist.HR_STR
data_hist.HR_TOT
data_hist.HR_TOT_WORKED
data_hist.HR_VAC
data_hist.OTH_PAY
data_hist.OVT_PAY
data_hist.PAYDT
data_hist.PERID
data_hist.PERNR
data_hist.PLSTX
data_hist.PRE_PAY
data_hist.RATR_OF_PAY_HORLY
data_hist.RATR_OF_PAY_WEEKLY
data_hist.REG_PAY
data_hist.RESULT
data_hist.SEQNR
data_hist.SIC_PAY
data_hist.SNAME
data_hist.STLX
data_hist.STR_PAY
data_hist.Subtotal
data_hist.TERMDT
data_hist.TOT_PAY
data_hist.VAC_PAY
data_hist.VDSK1_TEXT
data_hist.WEEK_BEGIN_DATE
data_hist.WEEK_ENDING_DATE
data_hist.WOSTD