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Commit d2e081a1 authored by Wanxin Li's avatar Wanxin Li
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Update README.md

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...@@ -86,40 +86,41 @@ Entity descriptions for algebra in lisp form. There are two sorts of operators: ...@@ -86,40 +86,41 @@ Entity descriptions for algebra in lisp form. There are two sorts of operators:
names, and (2) operators producing “column tables”, where tuples are a possibly names, and (2) operators producing “column tables”, where tuples are a possibly
infinite set of “SQLP column name”/“constant” pairs. infinite set of “SQLP column name”/“constant” pairs.
&le query &gt (1)
`<query> (1)
( select <set-or-bag> <limit> (as-list <as> … ) <body> ) ( select <set-or-bag> <limit> (as-list <as> … ) <body> )
( union <set-or-bag> <limit> (query-list <query> … ) ) ( union <set-or-bag> <limit> (query-list <query> … ) )`
<set-or-bag> `<set-or-bag>
distinct distinct
all all`
<limit> `<limit>
( limit <integer-constant> ) ( limit <integer-constant> )
( no-limit ) ( no-limit )`
<as> `<as>
( as <column> <attribute-name> ) ( as <column> <attribute-name> )`
<body> (2) `<body> (2)
<pred> <pred>
( atom <table-name> <var> ) ( atom <table-name> <var> )
( natural-join-list <body> … ) ( natural-join-list <body> … )
( sub-query <query> <var> ) ( sub-query <query> <var> )`
<pred> `<pred>
( equal <term> <term> ) ( equal <term> <term> )
( less-than <term> <term> ) ( less-than <term> <term> )
( less-than-or-equal <term> <term> ) ( less-than-or-equal <term> <term> )
( exists <body> ) ( exists <body> )
( not <pred> ) ( not <pred> )
( and-list <pred> … ) ( and-list <pred> … )
( or-list <pred> … ) ( or-list <pred> … )`
<term> `<term>
<column> <column>
( integer <integer-constant> ) ( integer <integer-constant> )
( string <string-constant> ) ( string <string-constant> )`
<column> `<column>
( column <var> ( attribute-name-list <attribute-name> … ) ) ( column <var> ( attribute-name-list <attribute-name> … ) )`
\ No newline at end of file \ No newline at end of file
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