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  2. Hierarchical and recursive queries in SQL - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_and_recursive...

    A common table expression, or CTE, (in SQL) is a temporary named result set, derived from a simple query and defined within the execution scope of a SELECT, INSERT, UPDATE, or DELETE statement. CTEs can be thought of as alternatives to derived tables , views, and inline user-defined functions.

  3. Comparison of relational database management systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_relational...

    Note (1): Server provides tempdb, which can be used for public and private (for the session) temp tables. [ 84 ] Note (2): Materialized views are not supported in Informix; the term is used in IBM's documentation to refer to a temporary table created to run the view's query when it is too complex, but one cannot for example define the way it is ...

  4. Maximum time interval error - Wikipedia

    en.wikipedia.org/wiki/Maximum_time_interval_error

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  5. Tail value at risk - Wikipedia

    en.wikipedia.org/wiki/Tail_value_at_risk

    In financial mathematics, tail value at risk (TVaR), also known as tail conditional expectation (TCE) or conditional tail expectation (CTE), is a risk measure associated with the more general value at risk. It quantifies the expected value of the loss given that an event outside a given probability level has occurred.

  6. Flat no-leads package - Wikipedia

    en.wikipedia.org/wiki/Flat_no-leads_package

    The significantly lower standoff in QFN packages can lead to higher thermomechanical strains due to coefficient of thermal expansion (CTE) mismatch as compared to leaded packages. For example, under accelerated thermal cycling conditions between -40 °C to 125 °C, various quad flat package (QFP) components can last over 10,000 thermal cycles ...

  7. Test and evaluation master plan - Wikipedia

    en.wikipedia.org/wiki/Test_and_evaluation_master...

    Test and evaluation master plan (TEMP) is a critical aspect of project management involving complex systems that must satisfy specification requirements. The TEMP is used to support programmatic events called milestone decisions that separate the individual phases of a project.

  8. High-temperature operating life - Wikipedia

    en.wikipedia.org/wiki/High-temperature_operating...

    The tables below provide reference to various commonly used products and the conditions under which they are used. Reliability engineers are tasked with verifying the adequate stress duration. For example, for an activation energy of 0.7 eV, a stress temperature of 125 °C and a use temperature of 55 °C, an expected operational life of five ...

  9. Polyethylene naphthalate - Wikipedia

    en.wikipedia.org/wiki/Polyethylene_naphthalate

    PEN is used for manufacturing high performance fibers that have very high modulus and better dimensional stability than PET or Nylon fibers. PEN is used as the substrate for most Linear Tape-Open (LTO) cartridges. It also has been found to show excellent scintillation properties and is expected to replace classic plastic scintillators. [2]