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Showing posts from April, 2014

The Muggy Weather Robotics Duo

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 The Muggy Weather Robotics Duo A C++ System That Thinks, Feels (Sensors!), and Acts Humidity is like the quiet character in the weather story that actually runs the show. On muggy days, everything feels heavier—breathing, drying laundry, running machines, even keeping a data center cool. For people, it’s about comfort and health; for machines, it’s about performance and reliability; for plants and buildings, it’s about moisture balance and mold risk. In robotics and automation, muggy weather isn’t just a nuisance—it’s a signal . It tells your systems when to ventilate, when to dehumidify, when to throttle physically demanding tasks, and when to take preventative maintenance actions. Today, we’ll build a two-program C++ system that “understands” muggy weather: Program A — sensor_hub.cpp A sensor-side program that generates (or ingests) a live stream of environmental data (temperature, relative humidity, pressure, CO₂, VOCs). Think of it as your robotic nose and skin , con...
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oracle dba: SQL statements

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oracle dba: SQL statements : SQL statements supported by oracle comply with industry standards DML DDL DCL   Transaction control  DML select insert update ...
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SQL statements

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SQL statements supported by oracle comply with industry standards DML DDL DCL   Transaction control  DML select insert update delete merge DDL create alter drop rename truncate comment DCL grant revoke Transaction control commit rollback savepoint
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oracle dba: Using SQL to query your database

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oracle dba: Using SQL to query your database : In relational database you do not need to specify the access route to the tables ,and you do not need to know how the data is arranged phys...
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Using SQL to query your database

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In relational database you do not need to specify the access route to the tables ,and you do not need to know how the data is arranged physically.SQL is ANSI standard language for operating relational database .It is a set of  statements in which all programs and users access data in oracle db. SQL provides statements for a variety of tasks ,such as, Querying data Inserting,updating and deleting rows in a table Creating, replacing ,altering and dropping objects Controlling access to db  Guaranteeing db integrity
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oracle dba: Oracle............Relating multiple tables

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oracle dba: Oracle............Relating multiple tables : Each table  contains data that describes exactly one entity,e.g  the EMPLOYEES  table  contains  information about employees .By using a ...
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Oracle............Relating multiple tables

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Each table  contains data that describes exactly one entity,e.g  the EMPLOYEES  table  contains  information about employees .By using a table format  ,you can readily understand and use information.Because data about different entities is stored in different tables ,you need to combine two or more tables ,to answer a particular question ,e.g you may want to know the location of the department where an employee works.In this scenario ,you need info from EMPLOYEES   table and the DEPARTMENTS table . With an RDBMS  you can relate data in one table to the data in another by using foreign keys. A foreign key is a column  that refers to a primary  key in the same table or another table .Each row of data in a table is uniquely identified by a primary key. You can logically relate data from multiple tables using foreign keys.
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