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Data Analysis Expressions (DAX) is the native formula and query language for Microsoft PowerPivot, Power BI Desktop and SQL Server Analysis Services (SSAS) Tabular models. DAX includes some of the functions that are used in Excel formulas with additional functions that are designed to work with relational data and perform dynamic aggregation .
The answer may be "zero" (we know that he owns none) or "null" (we do not know how many he owns). In a database table, the column reporting this answer would start with no value (marked by null), and it would not be updated with the value zero until it is ascertained that Adam owns no books. In SQL, null is a marker, not a value.
Similarly the type checking functions return a Boolean recording whether the argument expression is of a particular type. In Transact-SQL, the functions return zero or one rather than Boolean values True and False. IsArray(name) This function determines whether the variable name passed as its argument is an array.
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Extract lowest set bit in source argument. Returns 0 if source argument is 0. Equivalent to dst = (-src) AND src: BLSMSK reg,r/m: VEX.LZ.0F38 F3 /2: Generate a bitmask of all-1s bits up to the lowest bit position with a 1 in the source argument. Returns all-1s if source argument is 0. Equivalent to dst = (src-1) XOR src: BLSR reg,r/m: VEX.LZ ...
I believe there are either two conventions for Return to Zero encoding or what is currently listed on the wiki page is not the correct implementation of RZ encoding. In return-to-zero (RZ) encoding, a binary 1 is represented by a full power voltage in the first half of the bit time and zero voltage in the second half of the bit time.
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