Kurdish-run prisons hold about 8,000 suspected IS fighters and around 34,000 of their family members in camps.
Also: The Apple Watch missed my hypertension - but this blood pressure wearable caught it instantly
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In SQL, we have tables containing individual rows. Tables have strict schemas that every row must obey; there are columns with types and other possible constraints: unique, not null, value checks or references to rows of other tables. Referential integrity lies at the heart of this data approach - guarantee that if row B1 of table B references row A1 of table A, referred row (A1) must exist; orphan rows are not allowed. If we want to delete A1 row, there are two options:
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