Join with a "built" field

Have a situation where I want to join two views one of which contains a column containing the entire key I want to join on and the second view has multiple columns that could be concatinated to to make the coluimn from the first view.
example: view1 columnx = trnx_8123_01
view2 columna = trnx, columnb = 8123, columnc = 01
What would be the syntax to do the join?
Further, suppose view2 could not always be depended on to have a value in columnc, but rather would sometimes need to have the value of to be used as columnc interpreted from the value of another column in view2
example: view1 columnx = trnx_8123_01
view2 columna = trnx, columnb = 8123, columnc = ' ' columnd='CCH' where CCH could be interpreted as meaning columnc should be interpreted as having value '01', but if the value was 'AAH' columnc should be interpreted as having value '02'
What would the query look like then? Is it possible to build the join field based on the content of another field?
Thanks much for any help,

well you just need to build up a composite value from the values at hand:
select *
  from view1 v1
  join view2 v2 on v1.columnx = v2.columna||'_'||
                                v2.columnb||'_'||
                                nvl(v2.columnc,case v2.columnd
                                               when 'CCH' then '01'
                                               when 'AAH' then '02'
                                               end)

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    A
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    C
    D
    D
    E
    F
    G
    H
    a1
    b1
    c1
    1
    1
    e1
    f1
    g1
    h1
    a2
    b2
    c2
    1
    3
    e2
    f2
    g2
    h2
    a3
    b3
    c3
    2
    4
    e3
    f3
    g3
    h3
    a4
    b4
    c4
    3
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    Inner Join
    A
    B
    C
    D
    D
    E
    F
    G
    H
    a1
    b1
    c1
    1
    1
    e1
    f1
    g1
    h1
    a2
    b2
    c2
    1
    1
    e1
    f1
    g1
    h1
    a4
    b4
    c4
    3
    3
    e2
    f2
    g2
    h2
    |--||||||||--|
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    CONNID LIKE SFLIGHT-CONNID.
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    AND F~FLDATE BETWEEN '20010910' AND '20010920'
    AND FSEATSOCC < FSEATSMAX.
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    Example
    Output of a list of all flights from Frankfurt to New York between September 10th and 20th, 2001 that are not sold out:
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    INTO (CARRID, CONNID, DATE)
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    ON FCARRID = PCARRID
    WHERE FCONNID = PCONNID
    AND P~CITYFROM = 'FRANKFURT'
    AND P~CITYTO = 'NEW YORK'
    AND F~FLDATE BETWEEN '20010910' AND '20010920'
    AND FSEATSOCC < FSEATSMAX.
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    Each comparison in the ON condition must contain a field from the right-hand table.
    If an outer join occurs in the FROM clause, all the ON conditions must contain at least one "real" JOIN condition (a condition that contains a field from tabref1 amd a field from tabref2.
    Note
    In some cases, '*' may be specified in the SELECT clause, and an internal table or work area is entered into the INTO clause (instead of a list of fields). If so, the fields are written to the target area from left to right in the order in which the tables appear in the FROM clause, according to the structure of each table work area. There can then be gaps between table work areas if you use an Alignment Request. For this reason, you should define the target work area with reference to the types of the database tables, not simply by counting the total number of fields. For an example, see below:
    Variant 3
    ... FROM tabref1 LEFT [OUTER] JOIN tabref2 ON cond
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    In order to determine the result of a SELECT command where the FROM clause contains a left outer join, the database system creates a temporary table containing the lines that meet the ON condition. The remaining fields from the left-hand table (tabref1) are then added to this table, and their corresponding fields from the right-hand table are filled with ZERO values. The system then applies the WHERE condition to the table.
    Left outer join between table 1 and table 2 where column D in both tables set the join condition:
    Table 1 Table 2
    A
    B
    C
    D
    D
    E
    F
    G
    H
    a1
    b1
    c1
    1
    1
    e1
    f1
    g1
    h1
    a2
    b2
    c2
    1
    3
    e2
    f2
    g2
    h2
    a3
    b3
    c3
    2
    4
    e3
    f3
    g3
    h3
    a4
    b4
    c4
    3
    |--|||--|
    Left Outer Join
    A
    B
    C
    D
    D
    E
    F
    G
    H
    a1
    b1
    c1
    1
    1
    e1
    f1
    g1
    h1
    a2
    b2
    c2
    1
    1
    e1
    f1
    g1
    h1
    a3
    b3
    c3
    2
    NULL
    NULL
    NULL
    NULL
    NULL
    a4
    b4
    c4
    3
    3
    e2
    f2
    g2
    h2
    |--||||||||--|
    Example
    Output a list of all custimers with their bookings for October 15th, 2001:
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    BOOKING TYPE SBOOK.
    SELECT SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
    SBOOKFLDATE SBOOKCARRID SBOOKCONNID SBOOKBOOKID
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    FROM SCUSTOM LEFT OUTER JOIN SBOOK
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    SBOOK~FLDATE = '20011015'
    ORDER BY SCUSTOMNAME SBOOKFLDATE.
    WRITE: / CUSTOMER-NAME, CUSTOMER-POSTCODE, CUSTOMER-CITY,
    BOOKING-FLDATE, BOOKING-CARRID, BOOKING-CONNID,
    BOOKING-BOOKID.
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    If there are columns with the same name in both tables, you must distinguish between them by prefixing the field descriptor with the table name or using an alias.
    Note
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    Each comparison in the ON condition must contain a field from the right-hand table.
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    The ON condition must contain at least one "real" JOIN condition (a condition in which a field from tabref1 as well as from tabref2 occurs).
    Note
    In some cases, '*' may be specivied as the field list in the SELECT clause, and an internal table or work area is entered in the INTO clause (instead of a list of fields). If so, the fields are written to the target area from left to right in the order in which the tables appear in the llen in der FROM clause, according to the structure of each table work area. There can be gaps between the table work areas if you use an Alignment Request. For this reason, you should define the target work area with reference to the types of the database tables, as in the following example (not simply by counting the total number of fields).
    Example
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    FLIGHT TYPE SFLIGHT,
    PFLI TYPE SPFLI,
    CARR TYPE SCARR,
    END OF WA.
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    AND P~CITYTO = 'NEW YORK'
    AND F~FLDATE BETWEEN '20010910' AND '20010920'
    AND FSEATSOCC < FSEATSMAX.
    WRITE: / WA-CARR-CARRNAME, WA-FLIGHT-FLDATE, WA-FLIGHT-CARRID,
    WA-FLIGHT-CONNID.
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    Syntax
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    {[INNER] JOIN}|{LEFT [OUTER] JOIN}
    {dbtab_right [AS tabalias_right] ON join_cond} [)] ... .
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    AS can be used to specify an alternative table name tabalias for each of the specified database table names or for every view. A database table or a view can occur multiple times within a join expression and, in this case, have various alternative names.
    The syntax of the join conditions join_cond is the same as that of the sql_cond conditions after the addition WHERE, with the following differences:
    At least one comparison must be specified after ON.
    Individual comparisons may be joined using AND only.
    All comparisons must contain a column in the database table or the view dbtab_right on the right-hand side as an operand.
    The following language elements may not be used: BETWEEN, LIKE, IN.
    No sub-queries may be used.
    For outer joins, only equality comparisons (=, EQ) are possible.
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    Resulting set for inner join
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    carrname TYPE scarr-carrname,
    connid TYPE spfli-connid,
    END OF wa.
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    SELECT ccarrname pconnid f~fldate
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    AND p~cityto = p_cityto )
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    WRITE: / wa-fldate, wa-carrname, wa-connid.
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