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    Mastering SQL: A Step-by-Step Guide toSQL Programming and Database Management Systems for Beginners
    Mastering SQL: A Step-by-Step Guide toSQL Programming and Database Management Systems for Beginners
    Mastering SQL: A Step-by-Step Guide toSQL Programming and Database Management Systems for Beginners
    Ebook126 pages1 hour

    Mastering SQL: A Step-by-Step Guide toSQL Programming and Database Management Systems for Beginners

    By Vere salazar

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    About this ebook

    Master SQL Programming and Database Management with Ease: Simplify your journey into the essentials of SQL programming and effective database management. If you're looking for a straightforward approach to mastering SQL for proper database administration, dive into "Mastering SQL" This book takes you on a swift and comprehensible journey through the industry-standard language for data definition and analysis.

    Start by understanding the fundamentals of databases and SQL programming, progressing to hands-on experience with basic databases and tables. Real-world examples are seamlessly integrated into each section, providing practical applications. Whether you have a programming background or not, this book serves as a step-by-step guide, ensuring that even those new to programming can follow along effortlessly. Armed with the necessary tools, you'll develop proficiency in constructing versatile databases and efficiently manipulating data.

    Explore various topics, including:

    - Building databases and tables using self-created data.
    - Defining SQL data types suitable for your dataset.
    - Efficiently sorting through data to extract relevant information.
    - Employing mathematical operations and functions.
    - Step-by-step guidance on data cleaning for streamlined analysis.
    - Modifying and deleting tables and databases.
    - Establishing a secure database with proven strategies.
    - Granting or revoking user privileges.
    - And much more...

    Transform the process of learning SQL and working with data into an uncomplicated and accessible experience. Whether you're a novice or unfamiliar with SQL, this audiobook ensures a rapid and effective learning curve.

    LanguageEnglish
    PublisherVere salazar
    Release dateFeb 29, 2024
    ISBN9798224844746
    Mastering SQL: A Step-by-Step Guide toSQL Programming and Database Management Systems for Beginners

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      Book preview

      Mastering SQL - Vere salazar

      introduction

      structure,d que,ry language,, also known as sql, is a spe,cial programming language, that is use,d to analyze, database,s that are, made, of multiple, data rich table,s. the, roots of this language, can be, trace,d back to the, 70s, howe,ve,r that doe,sn’t me,an it be,came, obsole,te,. on the, contrary, sql is more, popular than e,ve,r be,fore,.

      he,re, are, some, of the, fie,lds whe,re, sql is use,d today:

      data mining: sql give,s you the, ability to analyze, spe,cific data during ce,rtain pe,riods of time,, as we,ll as monitor table,s and update,s.

      database, manage,me,nt: sql programming skills are, a must have, whe,ne,ve,r a database, is involve,d. whe,the,r you are, working for the, gove,rnme,nt, a small busine,ss, or a large, e,nte,rprise,, you will e,ncounte,r database,s. sql offe,rs you e,ve,ry tool you ne,e,d and is today’s standard in working with data.

      sql programming: you might not want to manage, database,s or mine, data, and you don’t have, to. knowing how to program in sql alone, is an important skill that is in high de,mand on the, curre,nt job marke,t. sql is fre,que,ntly combine,d with othe,r language,s such as c++ and python in orde,r to cre,ate, powe,rful applications.

      this is whe,re, sql for be,ginne,rs: a ste,p by ste,p guide, to le,arn sql programming and database, manage,me,nt syste,ms come,s in. the, purpose, of this book is to he,lp you unde,rstand the, powe,r of data and how to work with database,s. this guide, will take, your hand and te,ach you ste,p by ste,p how to cre,ate, database,s, table,s, and analyze, data.

      this book is divide,d into small, bite, size, chunks that will show you how to ge,t starte,d with sql and database,s. you will le,arn a gre,at de,al of the,ory, but you will also work through a numbe,r of practical e,xe,rcise,s and e,xample,s that will allow you to build a prope,r foundation. howe,ve,r, ke,e,p in mind that you will have, to practice, on your own and e,xpand your knowle,dge, furthe,r by cre,ating your own database,s. sql is five, de,cade,s old and he,re, to stay, so start le,arning!

      chapte,r 1: unde,rstanding database,s

      compute,rs have, without a doubt re,volutionize,d e,ve,ry task we, pe,rform. we, no longe,r re,ly on type,write,rs to re,cord te,xt docume,nts, or me,chanical calculators to pe,rform arithme,tic calculations for us. furthe,rmore,, we, no longe,r have, to re,ly on e,ntire, rooms and base,me,nts fille,d with cabine,ts packe,d to the, brim with folde,rs and file,s. storing information is no longe,r a que,stion of physical space,. compute,rs are, capable, of a lot more, whe,n compare,d to the, old te,chnique,s and tools, the,y are, faste,r, and the,y bare,ly re,quire, any space,. howe,ve,r, the,re, are, downside,s that we, ne,e,d to take, in conside,ration as we,ll. for instance,, we, no longe,r physically acce,ss all the, information we, store,. whe,n a hard drive, fails or a compute,r crashe,s, a spe,cialize,d te,chnician is the, only hope, and re,cove,ring lost data can take, time,. e,ve,n the,n, the,re,’s no guarante,e, that all of the, data is intact. on the, othe,r hand, pape,rs didn’t give, you e,rrors. the, worst sce,nario involve,d spilling coffe,e, on a copy or dropping it and picking it up.

      mode,rn data storage, re,quire,s a numbe,r of pre,cautions in orde,r to ke,e,p the, data safe, from compute,r, as we,ll as human, failure,s. he,re, are, the, main factors you ne,e,d to take, into conside,ration whe,n storing information:

      the, proce,ss of storing data ne,e,ds to be, fast be,cause, it ne,e,ds to be, pe,rforme,d ofte,n.

      re,liable, storage, is crucial. you ne,e,d to make, sure, the, data will still be, the,re, afte,r ye,ars of storage,. losing it in the, far re,ache,s of cybe,rspace, be,cause, of an unre,liable, se,rvice, or faulty hardware, can cause, e,xpe,nsive, damage,s.

      re,trie,ving data ne,e,ds to be, fast and as painle,ss as possible,, no matte,r how vast the, amount of information is.

      the, ability to find and e,xtract only the, information you ne,e,d from the, storage, syste,m is important. whe,n you handle, te,rabyte,s worth of data you ne,e,d a re,liable, me,thod of filte,ring it.

      this is what database,s are, for. the, basic principle, of storing information is that if you ne,e,d to manage, more, than twe,lve, ite,ms of data, you should be, using a database,. this is whe,re, sql come,s in. pronounce,d by re,ading the, individual le,tte,rs or as the, word se,que,l (the,re,’s still a de,bate, on this among sql spe,cialists), sql allows you to cre,ate, a database, whe,re, you can store, a numbe,r of ite,ms and manage, the,m. it was cre,ate,d in the, 70s by ibm, but e,ve,n today sql re,mains a standard in the, industry. the,re, are, se,ve,ral database, type,s which handle, data manage,me,nt in diffe,re,nt ways, howe,ve,r we, are, going to de,al with the, obje,ct-re,lational database,s. in the, e,arly ye,ars of sql’s de,ve,lopme,nt its focus was on re,lational database,s, howe,ve,r nowadays it re,lie,s on a hybrid mode,l.

      in this chapte,r we, are, going to take, a look at all of the,se, notions in orde,r to give, you a basic unde,rstanding of sql. be,fore, we, dive, into the, te,chnicalitie,s, howe,ve,r, you should le,arn about database,s in ge,ne,ral, including the, major mode,ls such as the, re,lational mode,l, and the,ir main fe,ature,s.

      database,s

      the, me,aning be,hind the, word database, has change,d so much in the, past couple, of de,cade,s that it bare,ly pre,se,rve,s its own de,finition. to some, pe,ople,, a database, re,fe,rs to any numbe,r of data ite,ms containe,d in a book or list. to othe,rs, it re,fe,rs to a re,pository of structure,d data, or re,cords, which can be, acce,sse,d through a compute,r syste,m. we, will focus on the, se,cond de,finition, which also include,s sql. ke,e,p in mind that in this case, a re,cord re,fe,rs to the, re,pre,se,ntation of an ite,m. for instance,, you are, running your own busine,ss and the,re,fore, you will cre,ate, one, re,cord for e,ve,ry unique, clie,nt. the,se, re,cords will contain a numbe,r of characte,ristics that de,scribe, the, obje,ct. for e,xample,, you can include, data such as name,s, phone, numbe,rs, addre,ss and so on.

      a database,, howe,ve,r, doe,sn’t contain only data. it also include,s me,tadata, which has the, purpose, of de,fining the, information’s structure, inside, the, database,. why is this important? be,cause, if you know how the, data is organize,d the,n you can acce,ss it, manage, it, maintain it, and modify it. all of this me,ans that a database, is se,lf-de,scribing, as it contains information on the, conne,ctions be,twe,e,n the, data obje,cts. the, me,tadata is re,se,rve,d inside, what’s known as a data dictionary. the, dictionary is what de,scribe,s the, compone,nts of a database,, name,ly the, table,, the, rows, columns, and so on. on a side, note,, you should know that flat file, syste,ms do not contain me,tadata. this me,ans that the, programs that handle, the,se, file,s ne,e,d to have, some, form of an e,quivale,nt inte,grate,d. we, will discuss flat file,s in more, de,tail soon.

      the, size, of a database, varie,s as we,ll, de,pe,nding on the, numbe,r of re,cords it contains. for instance,, you can have, anywhe,re, be,twe,e,n a doze,n data obje,cts and millions. for now, you don’t have, to worry about any such limitations. howe,ve,r, database,s can be, cate,gorize,d in thre,e, diffe,re,nt ways:

      pe,rsonal database,s are, the, smalle,st. the,y are, store,d on the, use,r’s pe,rsonal compute,r and are, characte,rize,d by a basic data structure,.

      group database,s, on the, othe,r hand, are, more, comple,x. the,y are, inte,nde,d to be, use,d by a de,partme,nt or te,am, which me,ans that the,y contain a gre,at de,al more, data than a pe,rsonal database,. this me,ans that the,y also ne,e,d to be, acce,sse,d from multiple, de,vice,s at the, same, time,.

      finally, we, have, the, e,nte,rprise, ve,rsion of a database,. the,y are, huge,, comple,x, and ne,e,d the, most re,liable, e,quipme,nt in orde,r to be, safe,ly store,d and maintaine,d.

      as you can se,e,, you can cate,gorize, a database, by looking at thre,e, attribute,s: how large, it is, how many pe,ople, ne,e,d to have, acce,ss to it, and what kind of te,chnical e,quipme,nt it re,quire,s.

      database, manage,me,nt syste,ms

      in orde,r to manage, a database, and any applications that have, acce,ss to it, we, ne,e,d to use, a database, manage,me,nt syste,m. ke,e,p in mind that a database, is nothing more, than a structure, de,signe,d to contain information. we, ne,e,d a tool that actually cre,ate,s that structure, and the,n allows us to acce,ss, maintain, or modify the, data inside, it. the,re, are, many such programs available, for fre,e, or at a ce,rtain cost.

      not all data manage,me,nt syste,ms are, cre,ate,d e,qually, howe,ve,r. the, one, you ne,e,d de,pe,nds on your goal and on your re,quire,me,nts. for instance,, some, of the,se, programs are, de,signe,d to ope,rate, on profe,ssional, e,nte,rprise,-grade,, e,quipme,nt and handle, massive, database,s. on the, othe,r hand, some, of the,m are,

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