PostgreSQL does not implement the UNKNOWN literal (although it does implement the IS UNKNOWN operator, which is an orthogonal feature).
It is operated by Safaricom, Kenya's biggest mobile operator, which is an affiliate of Vodafone.
The operator, which is jointly owned by Verizon Comunications and the Vodafone Group, has about $815 million in total debt.
Under civil aviation rules, unmanned aircraft must be within the eyesight of the operator, which is usually held to mean an altitude of 120 metres.
Hong Kong's Hutchison Whampoa holds a 2percentt stake in China Unicom, China's second mobile telephone operator, which is shopping for a still larger strategic investor.
Mr. Buffett's successor will have to be not just a great investor and operator, which is difficult enough, but a legendary one that people will rally around.
TWO models clashed in the bitter month-long battle for SFR, France's second-biggest telecoms operator, which is owned by Vivendi.
His son Lawrence is CEO of Melco Crown Entertainment, a casino operator which is a joint venture with Australia's Crown Ltd.
Ooredoo, a Qatari mobile-telecoms operator which is building one of the country's new networks, has also been promoting local startups.
Verizon, a big American operator which is deploying a high-speed fibre network in several regions, has asked equipment-makers to build gear that requires less power.
At the top of the list is a potential play for part of the Adelphia Communications Corporation, the nation's fifth-largest cable operator, which is expected to emerge from bankruptcy protection in the coming months.
