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SQL Set Operators

SQL Set Operators   Traditional Set Operators: Union Compatibility:     Requirement for the traditional set operators.    Strong requirement.                         - Same number of columns.                         - Each corresponding column is compatible.                         - Positional correspondence.     Apply to similar tables by removing columns first. SQL UNION Example:           Example 1: Retrieve basic data about all university people.                     SELECT FacNo AS PerNo, FacFirstName                                      ...
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Assembly Language Relate to Machine Language

 

 

Assembly Language Relate to Machine Language

Machine language is a numeric language specifically understood by a computer’s processor (the CPU). All x86 processors understand a common machine language. Assembly language consists of statements written with short mnemonics such as ADD, MOV, SUB, and CALL. Assembly language has a one-to-one relationship with machine language: Each assembly language instruction corresponds to a single machine-language instruction.

Assembly language is a more human readable view of machine language. Instead of representing the machine language as numbers, the instructions and registers are given names (typically abbreviated words, or mnemonics, eg ld means "load"). Unlike a high-level language, assembler is very close to the machine language.

In Assembly, instructions are easier-to-understand representations of CPU instructions. But the assembler also makes, for example, addressing easier:

•          In machine language you have to know the distance (in address space) between where you are and where you want to jump to

•          In Assembly language you call one address "I Want To Jump Here" and then you can say "jump I Want To Jump Here". 




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SQL Set Operators

SQL Set Operators   Traditional Set Operators: Union Compatibility:     Requirement for the traditional set operators.    Strong requirement.                         - Same number of columns.                         - Each corresponding column is compatible.                         - Positional correspondence.     Apply to similar tables by removing columns first. SQL UNION Example:           Example 1: Retrieve basic data about all university people.                     SELECT FacNo AS PerNo, FacFirstName                                      ...
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