{"id":7672,"date":"2021-09-20T10:11:38","date_gmt":"2021-09-20T08:11:38","guid":{"rendered":"https:\/\/www.vita.sk\/?post_type=product&#038;p=7672"},"modified":"2026-10-23T18:56:24","modified_gmt":"2026-10-23T16:56:24","slug":"online-kurz-jazyk-sql-i-zaciatocnik","status":"publish","type":"product","link":"https:\/\/www.vita.sk\/en\/online-kurz-jazyk-sql-i-zaciatocnik\/","title":{"rendered":"Online kurz Jazyk SQL I. Za\u010diato\u010dn\u00edk"},"content":{"rendered":"<p>Online kurz Jazyk SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed orientova\u0165 sa v datab\u00e1zach, pripoji\u0165 sa k nim a vytv\u00e1ra\u0165 prv\u00e9 SQL dopyty. <strong>Ide o certifikovan\u00fd online kurz na jazyk SQL.<\/strong> Predch\u00e1dzaj\u00face sk\u00fasenosti s datab\u00e1zami ani programovan\u00edm nepotrebujete. Za\u010dneme z\u00e1kladn\u00fdmi pojmami a vysvetl\u00edme si rozdiel medzi datab\u00e1zou, syst\u00e9mom na jej spr\u00e1vu a samotn\u00fdm jazykom SQL. Obozn\u00e1mime sa s pojmami DBMS a RDBMS a uk\u00e1\u017eeme si, ako rozpozna\u0165 pou\u017e\u00edvan\u00fd datab\u00e1zov\u00fd syst\u00e9m. Pomocou DBeaver vytvor\u00edme datab\u00e1zov\u00e9 pripojenie, zorientujeme sa v dostupn\u00fdch tabu\u013ek\u00e1ch a priprav\u00edme prostredie na p\u00edsanie skriptov. Z\u00edskame preh\u013ead o tom, kde s\u00fa \u00fadaje ulo\u017een\u00e9 a ako sa k nim dostaneme.<\/p>\n<p>&nbsp;<\/p>\n<p>Pri pr\u00e1ci s \u00fadajmi sa s\u00fastred\u00edme na SELECT, IN a BETWEEN. Nau\u010d\u00edme sa vybera\u0165 potrebn\u00e9 st\u013apce a filtrova\u0165 z\u00e1znamy pod\u013ea zoznamu hodn\u00f4t alebo zadan\u00e9ho rozsahu. V MySQL vyu\u017eijeme aj pr\u00edkaz USE na v\u00fdber aktu\u00e1lnej datab\u00e1zy. Prejdeme k agrega\u010dn\u00fdm funkci\u00e1m a GROUP BY, pomocou ktor\u00fdch priprav\u00edme s\u00fa\u010dty, po\u010dty a \u010fal\u0161ie s\u00fahrnn\u00e9 v\u00fdsledky. Takto m\u00f4\u017eeme napr\u00edklad porovna\u0165 predaj pod\u013ea kateg\u00f3ri\u00ed alebo zisti\u0165 po\u010det z\u00e1znamov v jednotliv\u00fdch skupin\u00e1ch. Vysvetl\u00edme si pou\u017eitie DISTINCT pri v\u00fdbere jedine\u010dn\u00fdch v\u00fdsledkov a vytvor\u00edme vypo\u010d\u00edtavan\u00e9 st\u013apce. Zameriame sa tie\u017e na funkcie LENGTH a LEFT, logick\u00fd oper\u00e1tor XOR a pr\u00e1cu so \u0161peci\u00e1lnymi znakmi a Unicode. Pri textov\u00fdch \u00fadajoch budeme rozli\u0161ova\u0165 ich obsah, d\u013a\u017eku a sp\u00f4sob ulo\u017eenia.<\/p>\n<p>&nbsp;<\/p>\n<p>Samostatn\u00fa pozornos\u0165 venujeme \u0161trukt\u00fare a form\u00e1tovaniu SQL skriptov. Uk\u00e1\u017eeme si, ako usporiada\u0165 jednotliv\u00e9 \u010dasti dopytu tak, aby sme sa v z\u00e1pise vedeli r\u00fdchlo zorientova\u0165 a nesk\u00f4r ho upravi\u0165. Pomocou snippetov a \u0161abl\u00f3n SQL si zjednodu\u0161\u00edme opakovan\u00e9 p\u00edsanie rovnak\u00fdch \u010dast\u00ed pr\u00edkazov. Vysvetl\u00edme si z\u00e1kladn\u00e9 kateg\u00f3rie SQL pr\u00edkazov a ich \u00fa\u010del pri pr\u00e1ci s datab\u00e1zou. N\u00e1sledne prejdeme na MySQL a phpMyAdmin, kde vytvor\u00edme datab\u00e1zu, obozn\u00e1mime sa s tabu\u013ekami a vyu\u017eijeme konzolu na zad\u00e1vanie SQL. Prepoj\u00edme tak p\u00edsanie dopytov s orient\u00e1ciou v grafickom rozhran\u00ed datab\u00e1zov\u00e9ho n\u00e1stroja. Osvojen\u00e9 postupy vyu\u017eijeme pri pr\u00edprave jednoduch\u00fdch reportov, kontrole \u00fadajov aj komunik\u00e1cii s analytikmi a v\u00fdvoj\u00e1rmi. Ak sa chcete skuto\u010dne nau\u010di\u0165 z\u00e1klady jazyka SQL, z\u00edskava\u0165 \u00fadaje z datab\u00e1z a p\u00edsa\u0165 preh\u013eadn\u00e9 dopyty, tak toto je ide\u00e1lny vstupn\u00fd online kurz pre v\u00e1s.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Online kurz Jazyk SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed prip\u00e1ja\u0165 sa k datab\u00e1zam, p\u00edsa\u0165 SELECT dopyty a zoskupova\u0165 \u00fadaje. Prejdeme funkcie, vypo\u010d\u00edtavan\u00e9 st\u013apce, snippety a pr\u00e1cu s DBeaver, MySQL a phpMyAdmin.","protected":false},"author":4,"featured_media":4265,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[55,49,73],"product_tag":[188,347,353,1289,1670,1704,2026,2027,2028,2029,2030,2031],"class_list":{"0":"post-7672","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-online-kurzy-sql","7":"product_cat-online-kurzy-databazy-statistika-analytika","8":"product_cat-bez-kategorie","9":"product_tag-databazy-a-analytika","10":"product_tag-sql","11":"product_tag-jazyk-sql","12":"product_tag-mysql","13":"product_tag-relacne-databazy","14":"product_tag-dbeaver","15":"product_tag-sql-pre-zaciatocnikov","16":"product_tag-phpmyadmin","17":"product_tag-databazove-dopyty","18":"product_tag-agregacne-funkcie","19":"product_tag-group-by","20":"product_tag-sql-skripty","22":"first","23":"instock","24":"sale","25":"virtual","26":"sold-individually","27":"taxable","28":"purchasable","29":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Online kurz Jazyk SQL I. 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Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed p\u00edsa\u0165 SELECT dopyty, filtrova\u0165 a zoskupova\u0165 \u00fadaje a pracova\u0165 s DBeaver, MySQL a phpMyAdmin. \u2705\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.vita.sk\/online-kurz-jazyk-sql-i-zaciatocnik\/\" \/>\n<meta property=\"og:site_name\" content=\"VITA\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/VitaAcademySK\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-23T16:56:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.vita.sk\/wp-content\/uploads\/2020\/11\/kurz-sql.png\" \/>\n\t<meta property=\"og:image:width\" content=\"360\" \/>\n\t<meta property=\"og:image:height\" content=\"360\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\n\t    \"@context\": \"https:\/\/schema.org\",\n\t    \"@graph\": [\n\t        {\n\t            \"@type\": \"WebPage\",\n\t            \"@id\": \"https:\/\/www.vita.sk\/online-kurz-jazyk-sql-i-zaciatocnik\/\",\n\t            \"url\": \"https:\/\/www.vita.sk\/online-kurz-jazyk-sql-i-zaciatocnik\/\",\n\t            \"name\": \"Online kurz Jazyk SQL I. 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