tsql - How to get the previous value of another field when I have specific data? -


i have message table these columns:

unit    state     logid    messageid ```````````````````````````````````` unit1   status1   1        1 unit8   status2   5        1 unit3   *         3        1 unit5   status3   6        1 unit2   status2   11       5 unit6   *         2        5 unit4   status4   8        5 unit11  *         9        5

i want previous value of unit field when state of messages * need result @ last:

unit    state   logid   messageid ````````````````````````````````` unit8   *       3       1 unit2   *       2       5 unit4   *       9       5


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