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Commit 0f148daf authored by Wanxin Li's avatar Wanxin Li
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update README.md

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...@@ -77,4 +77,48 @@ valid. ...@@ -77,4 +77,48 @@ valid.
Also the Makefile only has two commands, `make` and `make clean`. `make` will Also the Makefile only has two commands, `make` and `make clean`. `make` will
create both the SQLPParser and Parser programs to do what was described above. create both the SQLPParser and Parser programs to do what was described above.
Maybe this should be changed in the future to be separate but we'll leave that Maybe this should be changed in the future to be separate but we'll leave that
discussion for the future. discussion for the future.
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Added in Spring 2019:
Entity descriptions for algebra in lisp form. There are two sorts of operators:
(1) operators producing normal tables with an ordered finite sequence of attribute
names, and (2) operators producing “column tables”, where tuples are a possibly
infinite set of “SQLP column name”/“constant” pairs.
<query> (1)
( select <set-or-bag> <limit> (as-list <as> … ) <body> )
( union <set-or-bag> <limit> (query-list <query> … ) )
<set-or-bag>
distinct
all
<limit>
( limit <integer-constant> )
( no-limit )
<as>
( as <column> <attribute-name> )
<body> (2)
<pred>
( atom <table-name> <var> )
( natural-join-list <body> … )
( sub-query <query> <var> )
<pred>
( equal <term> <term> )
( less-than <term> <term> )
( less-than-or-equal <term> <term> )
( exists <body> )
( not <pred> )
( and-list <pred> … )
( or-list <pred> … )
<term>
<column>
( integer <integer-constant> )
( string <string-constant> )
<column>
( column <var> ( attribute-name-list <attribute-name> … ) )
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