We are living in an era which is dependent on information technology. Research, continuous development and creativity are some basic pillars of this field; so many candidates are making their careers in the same field. High salaries, heavy knowledge of system and software can be easily expected from an IT person. There are number of software, languages and systems each for multiple reasons; one has to possess some serious technical knowledge in order to use the before mentioned. Oracle is no new term for any of us; we all have seen it at least once a week during system updates, during normal software updates. This software has its own world and this world can only be understood via language which is exclusively made for Oracle license management. Let’s discuss something about SQL the language which can let one enter inside the world of Oracle:
SQL is a language based on two function named as: Single row functions and multi row function also referred as ‘aggregate function’. Single row as the name suggest generates and operates only a row at a time, and provides output for every single row. If one wants to manipulate, update or modify the data he/she should go from the first row function of the SQL language. This function provides one output for each row and act accordingly for each that is returned. The unique feature of this function is that it can accept multiple conditions and can return one value; still it is referred as single row function. Character, Number, General, Conversion and date are the sub functions under single row function. Character function can be further subdivided in two : Case manipulation and character manipulation under which upper case, lower case and initcap are considered under the umbrella of Case manipulation and Concat, Substr, legth, instr, Ipad, trim and replace are some character manipulation functions. Link here https://www.navicle.com/services/oracle-licence-audit/ offer a good Oracle that will suit your needs.
On the other hand, multiple/group/aggregate row functions are opposite to what we have discussed before, it works on multiple rows to provide single result for example: if one has a column mentioned ‘scores of the players’ one can use the multiple row functions to find out the max score count; multiple row function will evaluate all the values in the column and will provide one single result to the user. There are some common types of group functions such as: AVG, COUNT, MAX, MIN, STDDEV, SUM & VARIANCE. Take the same example if one has a data of employees salary, under oracle using the SQL language one can write something like: SQL> Select max(sal), min(sal), sum(sal) in order to get the maximum salary, minimum salary and sum of all salary. Hence single results will be provided by analyzing multiple rows.
This was just the glimpse of what SQL is but, one has to completely master in all the functions, kith and kin of this world Oracle in order to get the full results. Like we mentioned SQL is the key to Oracle.