Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/intersect.man

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+.TH intersect "" "" "/rdb Command"
+.PC "Write table of rows that are in both input tables"
+\fBintersect \fItable1 table2\fR
+.PP
+.II "
+.II sort
+.II uniq
+.II "table^intersect"
+.II "table^logical AND"
+.II "intersection of tables"
+The command
+.B intersect
+is a shell script that uses the COHERENT commands
+.B sort
+and
+.B uniq
+to perform a logical AND on two tables.
+It produces a new table that consists only of the rows that
+are in both of the input tables.
+The two input tables must have the same number of columns
+(called \fIunion compatible\fR), and
+rows must match exactly to be considered the same.
+.SH Example
+Consider the table
+.BR journal ,
+which appears as follows:
+.DM
+Date    Amount  Account Ref     Description
+------- ------- ------- ------- --------------------------------
+820107    14.00 meal    v       meal with jones
+820114    81.80 insur   c       car insurance allstate
+820119    81.72 vitamin c       sundown vitamins
+820121    20.83 meal    v       meal with scott
+820121  2500.00 keogh   c       keogh payment
+820125    99.00 dues    v       dues to uni-ops unix conference
+.DE
+.PP
+And consider the table
+.BR carexpense ,
+which appears as follows:
+.DM
+Date    Amount  Account Ref     Description
+------- ------- ------- ------- --------------------------------
+820113   101.62 car     v       car repairs
+820114    81.80 insur   c       car insurance allstate
+820114    93.00 car     c       car registration dmv
+.DE
+.PP
+To see if any rows in
+.B journal
+are also in
+.BR carexpense ,
+type the command:
+.DM
+	intersect journal carexpense
+.DE
+.PP
+In this example, you would see the following on the standard output:
+.DM
+Date    Amount  Account Ref     Description
+------- ------- ------- ------- --------------------------------
+820114    81.80 insur   c       car insurance allstate
+.DE
+.PP
+As you can see, the insurance expense was already posted to the
+general journal.
+.SH "See Also"
+.B
+difference,
+jointable,
+union
+.R
+.br
+COHERENT Lexicon:
+.B
+sort,
+uniq
+.R
+.SO intersect