Functional Indexes for Microsoft SQL Server

The following example shows how the key fields are concatenated:

USE FS840U70
go
SET IMPLICIT_TRANSACTIONS ON
go
IF EXISTS (SELECT 'X' FROM SYSOBJECTS WHERE TYPE = 'U' AND NAME =
 'PS_QE_ALTER_NEW') DROP TABLE PS_QE_ALTER_NEW
go
CREATE TABLE PS_QE_ALTER_NEW (QE_ALTER_FLD1 NCHAR(1) NOT NULL,
   QE_ALTER_FLD2 NCHAR(1) NOT NULL,
   QE_ALTER_FLD3 NCHAR(1) NOT NULL,
   QE_ALTER_FLD4 NCHAR(10) NOT NULL,
   QE_ALTER_FLD5 NCHAR(20) NOT NULL,
   QE_ALTER_FLD6 NCHAR(11) NOT NULL,
   QE_ALTER_FLD7 NCHAR(1) NOT NULL,
   QE_ALTER_FLD8 NCHAR(1) NOT NULL,
   QEPC_AGE SMALLINT NOT NULL,
   QEPC_FILE_NUM DECIMAL(6, 2) NOT NULL,
   QE_BEGIN_DT PSDATE NULL,
   QE_BIRTHDATE PSDATE NULL,
   QE_31DIGFLD9 DECIMAL(31, 8) NOT NULL,
   QE_ANNUAL_PCT DECIMAL(3, 1) NOT NULL,
   QE_MS_DTTM1 PSDATETIME NULL,
   QE_MS_DTTM2 PSDATETIME NULL,
   QE_ALTER_TIMEA PSTIME NULL,
   QE_ALTER_TIMEB PSTIME NULL,
   MSSCONCATCOL AS QE_ALTER_FLD1 + QE_ALTER_FLD2 + QE_ALTER_FLD3 +
 QE_ALTER_FLD4 + QE_ALTER_FLD5 + QE_ALTER_FLD6 + QE_ALTER_FLD7 +
 QE_ALTER_FLD8 + CONVERT(NCHAR,QEPC_AGE) + CONVERT(NCHAR
,QEPC_FILE_NUM) + CONVERT(NCHAR(16),QE_BEGIN_DT, 109) +
 CONVERT(NCHAR(16),QE_BIRTHDATE, 109) + CONVERT(NCHAR,QE_31DIGFLD9) +
 CONVERT(NCHAR,QE_ANNUAL_PCT) + CONVERT(NCHAR(16),QE_MS_DTTM1, 109) +
 CONVERT(NCHAR(16),QE_MS_DTTM2, 109) + CONVERT(NCHAR(16)
,QE_ALTER_TIMEA, 109))
go
COMMIT
go
SET ARITHABORT ON
go
CREATE UNIQUE CLUSTERED INDEX PS_QE_ALTER_NEW ON PS_QE_ALTER_NEW
 (MSSCONCATCOL)
go
CREATE  NONCLUSTERED INDEX PSWQE_ALTER_NEW ON PS_QE_ALTER_NEW
 (QE_ALTER_FLD1,
   QE_ALTER_FLD2,
   QE_ALTER_FLD3,
   QE_ALTER_FLD4,
   QE_ALTER_FLD5,
   QE_ALTER_FLD6,
   QE_ALTER_FLD7,
   QE_ALTER_FLD8,
   QEPC_AGE,
   QEPC_FILE_NUM,
   QE_BEGIN_DT,
   QE_BIRTHDATE,
   QE_31DIGFLD9,
   QE_ANNUAL_PCT,
   QE_MS_DTTM1,
   QE_MS_DTTM2)
go
COMMIT
Go