{"id":470,"date":"2021-04-01T13:18:43","date_gmt":"2021-04-01T11:18:43","guid":{"rendered":"http:\/\/vita.sk.vps202.nameserver.sk\/?post_type=product&#038;p=470"},"modified":"2026-10-23T19:24:13","modified_gmt":"2026-10-23T17:24:13","slug":"online-kurz-sql-ii-mierne-pokrocily","status":"publish","type":"product","link":"https:\/\/www.vita.sk\/en\/online-kurz-sql-ii-mierne-pokrocily\/","title":{"rendered":"Online kurz SQL II. Mierne Pokro\u010dil\u00fd"},"content":{"rendered":"<p>Online kurz SQL II. Mierne Pokro\u010dil\u00fd v\u00e1s nau\u010d\u00ed prep\u00e1ja\u0165 datab\u00e1zov\u00e9 \u00fadaje, vytv\u00e1ra\u0165 poddopyty a pou\u017e\u00edva\u0165 indexy pri pr\u00e1ci s rela\u010dn\u00fdmi datab\u00e1zami. <strong>Ide o certifikovan\u00fd online kurz na SQL.<\/strong> Nadvia\u017eeme na z\u00e1kladn\u00e9 znalosti pr\u00edkazu SELECT, filtrovania a pr\u00e1ce s tabu\u013ekami. Spolo\u010dne si vysvetl\u00edme rozdiely medzi rela\u010dn\u00fdmi a nerela\u010dn\u00fdmi datab\u00e1zami, v\u00fdznam datab\u00e1zov\u00fdch sch\u00e9m aj z\u00e1kladn\u00e9 vlastnosti transakci\u00ed ACID. Prejdeme k vnoren\u00fdm dopytom, pomocou ktor\u00fdch vyu\u017eijeme v\u00fdsledok jedn\u00e9ho dopytu v \u010fal\u0161om. Pri v\u00fdbere z\u00e1znamov budeme kombinova\u0165 IN, LIKE, BETWEEN a logick\u00e9 podmienky. Z\u00edskame tak postupy vyu\u017eite\u013en\u00e9 pri pr\u00edprave datab\u00e1zov\u00fdch v\u00fdstupov, vyh\u013ead\u00e1van\u00ed s\u00favisiacich z\u00e1znamov a kontrole \u00fadajov. Zameriame sa na pochopenie v\u00fdsledku aj na preh\u013eadn\u00fd z\u00e1pis podmienok.<\/p>\n<p>&nbsp;<\/p>\n<p>V praktickej \u010dasti online kurzu SQL sa nau\u010d\u00edme importova\u0165 \u00fadaje z CSV s\u00faborov a pripravi\u0165 ich na \u010fal\u0161ie spracovanie. Pri pr\u00e1ci s viacer\u00fdmi tabu\u013ekami vyu\u017eijeme INNER JOIN, LEFT JOIN a RIGHT JOIN. Vysvetl\u00edme si v\u00fdznam prim\u00e1rnych a cudz\u00edch k\u013e\u00fa\u010dov a rozl\u00ed\u0161ime spojenie riadkov v dopyte od definovania v\u00e4zieb v datab\u00e1ze. Na pr\u00edkladoch m\u00f4\u017eeme uva\u017eova\u0165 o prepojen\u00ed z\u00e1kazn\u00edkov, objedn\u00e1vok a produktov alebo o vyh\u013eadan\u00ed z\u00e1znamov bez zodpovedaj\u00facej polo\u017eky v druhej tabu\u013eke. Obozn\u00e1mime sa s indexmi, ich typmi a vplyvom na vyh\u013ead\u00e1vanie \u00fadajov. Zv\u00e1\u017eime pr\u00ednos indexovania aj jeho n\u00e1roky pri zmen\u00e1ch d\u00e1t. Pri pr\u00e1ci s datab\u00e1zov\u00fdmi sch\u00e9mami, tabu\u013ekami a indexmi vyu\u017eijeme aj prostredie MySQL Workbench.<\/p>\n<p>&nbsp;<\/p>\n<p>\u010ealej budeme pracova\u0165 s funkciami ABS, FLOOR, ROUND, TRIM a REPLACE, ktor\u00e9 vyu\u017eijeme pri v\u00fdpo\u010dtoch a \u00faprav\u00e1ch textov\u00fdch hodn\u00f4t. Prejdeme pretypovanie \u00fadajov, pr\u00e1cu s ASCII k\u00f3dmi a tvorbu ERD diagramov na zn\u00e1zornenie ent\u00edt, atrib\u00fatov a vz\u0165ahov. Samostatne sa budeme venova\u0165 riziku SQL injection a z\u00e1sad\u00e1m jeho prevencie. Pri hashovan\u00ed hesiel sa zameriame na v\u00fdznam ochrany ulo\u017een\u00fdch prihlasovac\u00edch \u00fadajov. Obozn\u00e1mime sa tie\u017e s bin\u00e1rnymi \u00fadajmi typu BLOB a exportovan\u00edm datab\u00e1zov\u00fdch \u00fadajov. Z\u00edskan\u00e9 vedomosti vyu\u017eijeme pri spolupr\u00e1ci na datab\u00e1zov\u00fdch aplik\u00e1ci\u00e1ch, pr\u00edprave analytick\u00fdch podkladov aj posudzovan\u00ed navrhnutej datab\u00e1zovej \u0161trukt\u00fary. Ak sa chcete skuto\u010dne nau\u010di\u0165 vytv\u00e1ra\u0165 zlo\u017eitej\u0161ie SQL dopyty, prep\u00e1ja\u0165 tabu\u013eky a rozumie\u0165 indexom aj bezpe\u010dnostn\u00fdm s\u00favislostiam, tak toto je ide\u00e1lny online kurz pre v\u00e1s.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Online kurz SQL II. Mierne Pokro\u010dil\u00fd v\u00e1s nau\u010d\u00ed pracova\u0165 s poddopytmi, joinmi, indexami, optimaliz\u00e1ciou v\u00fdkonu a bezpe\u010dnos\u0165ou datab\u00e1z tak, aby ste zvl\u00e1dli navrhova\u0165 a spravova\u0165 pokro\u010dilej\u0161ie datab\u00e1zov\u00e9 rie\u0161enia v praxi. Prejdeme vstavan\u00e9 funkcie, ERD modelovanie, exporty a z\u00e1klady ochrany pred SQL injection.","protected":false},"author":4,"featured_media":467,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[55,49,73],"product_tag":[1895,2035,2036,2037,2038,2039,2040,188,347,1670,1812],"class_list":{"0":"post-470","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-databazove-indexy","10":"product_tag-poddopyty","11":"product_tag-join","12":"product_tag-mysql-workbench","13":"product_tag-import-csv","14":"product_tag-sql-funkcie","15":"product_tag-erd-modelovanie","16":"product_tag-databazy-a-analytika","17":"product_tag-sql","18":"product_tag-relacne-databazy","19":"product_tag-sql-injection","21":"first","22":"instock","23":"sale","24":"virtual","25":"sold-individually","26":"taxable","27":"purchasable","28":"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 SQL II. 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Mierne Pokro\u010dil\u00fd v\u00e1s nau\u010d\u00ed pou\u017e\u00edva\u0165 poddopyty, JOIN a indexy, importova\u0165 CSV, modelova\u0165 datab\u00e1zy a rozumie\u0165 SQL injection. \u2705\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.vita.sk\/online-kurz-sql-ii-mierne-pokrocily\/\" \/>\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=\"2026-10-23T17:24:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.vita.sk\/wp-content\/uploads\/2018\/10\/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-sql-ii-mierne-pokrocily\/\",\n\t            \"url\": \"https:\/\/www.vita.sk\/online-kurz-sql-ii-mierne-pokrocily\/\",\n\t            \"name\": \"Online kurz SQL II. 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