System R


- 2


L------ L--------- ------ -------+------+---------- PARSEDSECT - - ( - 覦 - ) L------ L------T------T-----------

INDEFSECT -------+--------+------+---------- - - (PREPARE EXECUTE) L----------------------------------

.5 .

Compilesect Intersect Parsesect Indefsect ------------T------------T-----------T-----------T----------- Auxcall - - , - - - - - Com- pilesect Inter- sect, (- - ) ------------+------------+-----------+-----------+-----------+ Opencall - - - - , - , - - OPEN ------------+------------+-----------+-----------+-----------+ Fetchcall - - - - , - , - - FETCH ------------+------------+-----------+-----------+-----------+ Closecall - - - - , - , - - CLOSE ------------+------------+-----------+-----------+------------ ------------T------------------------T-----------T----------- Setupcall - , - - - , - , - (Com- pilesect Intersect) SQL (Compile- sect Intersect) - - SQL ------------+------------T-----------+-----------+-----------+ Describecall- - - - - - ------------+------------+-----------+-----------+------------

. 6 .

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