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Queries
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Selection:

correct: select ( age == 12 ) people ;
incorrect: select ( age ))))) people ;

Projection:

correct: project ( age ) people ;
incorrect: project age people ;

Renaming:

correct: rename ( age, years old ) ;
incorrect: rename age years ;

Set Union:

correct: union ( people + animals ) ;
incorrect: union people animals ;

Set Difference:

correct: difference ( people - animals ) ;
incorrect: difference people animals ;

Cross Product:

correct: product ( people * animals ) ;
incorrect: product people animals ;

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Commands
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Open:

correct: OPEN people ;
incorrect: OPEN ;

Close:

correct: CLOSE people ;
incorrect: CLOSE ;

Save:

correct: SAVE people ;
incorrect: SAVE ;

Exit:

correct: EXIT ;
incorrect: EXIT people ;

Show:

correct: SHOW people ;
incorrect: SHOW ;

Create:

correct: CREATE TABLE people ( age INTEGER, name VARCHAR ( 20 ) ) PRIMARY KEY ( name ) ;
incorrect: CREATE TABLE people age name ;

Update:

correct: UPDATE people SET ( age = 10 ) WHERE ( name == "Bob" ) ; 
incorrect: UPDATE ( age = 10 ) WHERE people ;

Insert:

correct: INSERT INTO people VALUES FROM ( 12, "Benny" ) ;
incorrect: INSERT INTO people 12 "Benny" ;

Delete:

correct: DELETE FROM people WHERE ( name == "John" ) ;
incorrect: DELETE IN people WHEN (name=John) ;