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                                                                    EXHIBIT 99.1


                                    EXHIBIT A




                 RELEVANT SUBSIDIARIES OF PARENT HOLDING COMPANY

PART A: TCW ENTITIES

PARENT HOLDING COMPANY:

             The TCW Group, Inc.

             Robert Day (an individual who may be deemed to control The TCW
             Group, Inc.)


RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13D-1(B):

             (i)  Trust Company of the West, a California corporation and a bank
                  as defined in Section 3(a)(6) of the Securities Exchange Act
                  of 1934.

             (ii) TCW Asset Management Company, a California corporation and an
                  Investment Adviser registered under Section 203 of the
                  Investment Advisers Act of 1940.

             (iii)TCW Investment Management Company, a California corporation
                  and an Investment Adviser registered under Section 203 of the
                  Investment Advisers Act of 1940.

Note:        No Common Stock of Retek, Inc. is held directly by The TCW
             Group, Inc. Other than the indirect holdings of The TCW Group,
             Inc., no Common Stock of Retek, Inc. is held directly or
             indirectly by Robert Day, an individual who may be deemed to
             control The TCW Group, Inc.

PART B: NON TCW ENTITIES

PARENT HOLDING COMPANY:

             Robert Day (an individual who may be deemed to control the entities
             described below which are not subsidiaries of The TCW Group, Inc.)

RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13D-1(B):

             Oakmont Corporation, a California corporation and an Investment
             Adviser registered under Section 203 of the Investment Advisers Act
             of 1940.

                                       A-1



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