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a link an ISBL introduction would be nice I could only find this https://www.dcs.warwick.ac.uk/people/academic/Meurig.Beynon/CS319/pdf/RelMod.pdf https://www.d
by VMG 3y ago
a link an ISBL introduction would be nice
I could only find this https://www.dcs.warwick.ac.uk/people/academic/Meurig.Beynon/CS319/pdf/RelMod.pdf https://www.dcs.warwick.ac.uk/people/academic/Meurig.Beynon/...
- rramadass 3y agoNice! It has a succinct overview of the Relational Model before discussing ISBL. There was a earlier thread today which is an interview with Chris Date where he mentions that QBE and ISBL are more "Relational" than SQL - https://news.ycombinator.com/item?id=39189015 https://news.ycombinator.com/item?id=39189015
- irq-1 3y agoSkip to page 11 in the PDF for examples. MEMBERS(NAME, ADDRESS, BALANCE) ORDERS(ORDER_NO, NAME, ITEM, QUANTITY) SUPPLIERS(SNAME, SADDRESS, ITEM, PRICE) 1. Print the names of members in the red: LIST MEMBERS : BALANCE < 0 % NAME i.e. select members with negative balance and project out their names