Go Hello, World through channels

Go is well known for it’s use of goroutines, the lightweight thread managed by the Go runtime. In the use of goroutines, we utilize channels. Channels, Channels are a conduit through which you can send and receive values. By default, sends and receives block until the other side is ready. This allows goroutines to synchronize…

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Oracle 1Z0-071, SQL Constraints

Unique Constraints Requires data in the column to be unique, multiple nulls are allowed. When used in conjunction with NOT NULL, it is effectively identical to a PRIMARY KEY. Cannot be applied to UNIQUE constraint on a column of TIMESTAMP WITH TIME ZONE , CLOB or BLOB datatype. Primary Key May be applied to more…

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Oracle 1Z0-071, Subqueries

What is subquery in SQL? A subquery is simply a SQL query nested inside a larger query. You may also hear or see subqueries referred to as inner queries or inner selects, and the outer query also referred to as the parent, outer query or outer select. How the SQL Engine works Be aware that…

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Oracle 1Z0-071, Character Data Types

Objective: Using DDL Statements to Create and Manage Tables, Describe data types that are available for columns. Char Fixed length Stored 1 character as 1 byte NChar Fixed Length Stores 1 character as 2 bytes UTF-16 encoding Typical outside of America In the case of NChar or Char, if you designate a column as 10…

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Python Tuples

Kind of like a list except immutable. Tuples serve as heterogeneous list. What are Tuples? Tuples are similar to lists, except they tend to be designed to be diverse in character as compared to lists in addition to performance advantages. The performance advantages of Tuples is largely attributed to their immutable nature. The immutability of…

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Mutability in object-oriented programming

What is Mutability? Mutability in object-oriented programming is the concept of how a data type handles change. Do we need to copy the value, can we share the value, can the value be altered once created? These are really fundamental and important questions to answer when it comes to integrity and reliability when it comes to…

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