What is a postgres tuple?

35

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if i want to give an alert message like "try after sometime" to a web page which is being seen by other person.if a web page is not seen by anyone then it should display otherwise it show a display a message stating that other person is viewing so try after some time........how can i implement this.

1328

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name useful online tools that can be used for better customer service

106

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What is the purpose of px measurement unit?

11

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How to use null as conditions in oracle?

90

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Explain the microsoft sql server delete command?

77

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how we control automatic generator i'e with to supply (main supply and local generator) when the main supply was break to supply the local supply automatically to begin supplying power.I now this control circuit is the combination of contactor time delay contactor switch and overload relay .but my question is how we combine those component thank you

980

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What is rollback trigger in a trigger?

91

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What are the 4 types of library?

70

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how many types of operators are include in c language a) 4 b) 6 c) 8 d) 12

120

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What is this keyword used for?

60

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multithreading??

950

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Can we use any name in place of argv and argc as command line arguments?

97

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What is php sequence?

63

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List the functions of a network administrator?

72

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