{"id":469,"date":"2021-07-01T13:19:02","date_gmt":"2021-07-01T11:19:02","guid":{"rendered":"http:\/\/vita.sk.vps202.nameserver.sk\/?post_type=product&#038;p=469"},"modified":"2026-10-23T19:08:14","modified_gmt":"2026-10-23T17:08:14","slug":"online-kurz-sql-i-zaciatocnik","status":"publish","type":"product","link":"https:\/\/www.vita.sk\/cs\/online-kurz-sql-i-zaciatocnik\/","title":{"rendered":"Online kurz SQL I. Za\u010diato\u010dn\u00edk"},"content":{"rendered":"<p>Online kurz SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed pracova\u0165 s datab\u00e1zami, vyh\u013ead\u00e1va\u0165 \u00fadaje a p\u00edsa\u0165 vlastn\u00e9 SQL dopyty od z\u00e1kladov. <strong>Ide o certifikovan\u00fd online kurz na SQL.<\/strong> Predch\u00e1dzaj\u00face sk\u00fasenosti s programovan\u00edm ani datab\u00e1zami nepotrebujete. Za\u010dneme vysvetlen\u00edm pojmov datab\u00e1za, tabu\u013eka, riadok, st\u013apec a datab\u00e1zov\u00fd syst\u00e9m DBMS. Rozl\u00ed\u0161ime jazyk SQL od syst\u00e9mov, ktor\u00e9 ho pou\u017e\u00edvaj\u00fa, a obozn\u00e1mime sa s MySQL, PostgreSQL a SQLite. Uk\u00e1\u017eeme si, ak\u00e9 \u00fadaje potrebujeme pri prip\u00e1jan\u00ed k datab\u00e1zov\u00e9mu serveru a ako sa od tohto postupu odli\u0161uje pr\u00e1ca s datab\u00e1zov\u00fdm s\u00faborom SQLite. Z\u00edskame tak preh\u013ead o prostred\u00ed, v ktorom budeme vytv\u00e1ra\u0165 a sp\u00fa\u0161\u0165a\u0165 svoje dopyty.<\/p>\n<p>&nbsp;<\/p>\n<p>Postupne si osvoj\u00edme SELECT, WHERE, ORDER BY a LIMIT. Nau\u010d\u00edme sa vybera\u0165 potrebn\u00e9 st\u013apce, filtrova\u0165 z\u00e1znamy pod\u013ea podmienok, zoradi\u0165 v\u00fdsledky a obmedzi\u0165 po\u010det zobrazen\u00fdch riadkov. Vyu\u017eijeme BETWEEN, IN, NOT IN a logick\u00e9 oper\u00e1tory. Pomocou SUM, COUNT a AVG priprav\u00edme z\u00e1kladn\u00e9 s\u00fahrnn\u00e9 v\u00fdpo\u010dty a cez GROUP BY a HAVING zoskup\u00edme \u00fadaje a vyberieme po\u017eadovan\u00e9 skupiny. Tak\u00e9to dopyty vyu\u017eijeme napr\u00edklad pri zis\u0165ovan\u00ed po\u010dtu objedn\u00e1vok, s\u00fa\u010dtu predaja alebo priemernej hodnoty z\u00e1znamov. Budeme pracova\u0165 aj s vypo\u010d\u00edtavan\u00fdmi st\u013apcami, textov\u00fdmi a d\u00e1tumov\u00fdmi funkciami. Vysvetl\u00edme si v\u00fdznam NULL, z\u00e1klady regul\u00e1rnych v\u00fdrazov a s\u00favislosti k\u00f3dovania znakov, ktor\u00e9 ovplyv\u0148uj\u00fa spracovanie textov\u00fdch \u00fadajov.<\/p>\n<p>&nbsp;<\/p>\n<p>V praktickej \u010dasti online kurzu SQL prejdeme in\u0161tal\u00e1ciou WampServera vo Windows a z\u00e1kladnou spr\u00e1vou MySQL cez phpMyAdmin. Obozn\u00e1mime sa s datab\u00e1zami, tabu\u013ekami, st\u013apcami, k\u013e\u00fa\u010dmi a pou\u017e\u00edvate\u013esk\u00fdmi \u00fa\u010dtami. Pomocou INSERT INTO a UPDATE budeme vklada\u0165 nov\u00e9 z\u00e1znamy a upravova\u0165 existuj\u00face \u00fadaje. Pri aktualiz\u00e1cii sa s\u00fastred\u00edme aj na spr\u00e1vne vymedzenie riadkov, ktor\u00e9 chceme zmeni\u0165. Uk\u00e1\u017eeme si import \u00fadajov a nadvia\u017eeme na\u0148 ich vyh\u013ead\u00e1van\u00edm a spracovan\u00edm pomocou SQL. Pri tvorbe dopytov budeme sledova\u0165 spr\u00e1vnos\u0165 podmienok, preh\u013eadnos\u0165 z\u00e1pisu a v\u00fdznam z\u00edskan\u00fdch v\u00fdsledkov. Nau\u010d\u00edme sa rozli\u0161ova\u0165 medzi \u010d\u00edtan\u00edm \u00fadajov a pr\u00edkazmi, ktor\u00e9 obsah datab\u00e1zy menia. Z\u00edskan\u00e9 z\u00e1klady vyu\u017eijeme pri reportingu, kontrole z\u00e1znamov, testovan\u00ed aplik\u00e1ci\u00ed aj \u010fal\u0161om \u0161t\u00fadiu datab\u00e1z a d\u00e1tovej analytiky. Ak sa chcete skuto\u010dne nau\u010di\u0165 pracova\u0165 s datab\u00e1zami a vytv\u00e1ra\u0165 SQL dopyty, tak toto je ide\u00e1lny vstupn\u00fd online kurz pre v\u00e1s.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Online kurz SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed vyh\u013ead\u00e1va\u0165, filtrova\u0165 a zoskupova\u0165 \u00fadaje pomocou jazyka SQL. Za\u010dneme z\u00e1kladmi datab\u00e1z a prejdeme k funkci\u00e1m, MySQL, phpMyAdmin aj vkladaniu a \u00faprave z\u00e1znamov.","protected":false},"author":27,"featured_media":467,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[55,49,178,73],"product_tag":[188,207,347,352,1289,1670,1672,2027,2032,2033,2034],"class_list":{"0":"post-469","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-najoblubenejsie-kurzy","9":"product_cat-bez-kategorie","10":"product_tag-databazy-a-analytika","11":"product_tag-postgresql","12":"product_tag-sql","13":"product_tag-sqlite","14":"product_tag-mysql","15":"product_tag-relacne-databazy","16":"product_tag-sql-dopyty","17":"product_tag-phpmyadmin","18":"product_tag-zaklady-databaz","19":"product_tag-select","20":"product_tag-wampserver","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 SQL pre za\u010diato\u010dn\u00edkov 2026 | VITA<\/title>\n<meta name=\"description\" content=\"Online kurz SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed pou\u017e\u00edva\u0165 SELECT, filtrova\u0165 a zoskupova\u0165 \u00fadaje, pracova\u0165 s MySQL a vklada\u0165 \u010di upravova\u0165 z\u00e1znamy. \u2705\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vita.sk\/online-kurz-sql-i-zaciatocnik\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Online kurz SQL I. Za\u010diato\u010dn\u00edk\" \/>\n<meta property=\"og:description\" content=\"Online kurz SQL I. Za\u010diato\u010dn\u00edk v\u00e1s nau\u010d\u00ed pou\u017e\u00edva\u0165 SELECT, filtrova\u0165 a zoskupova\u0165 \u00fadaje, pracova\u0165 s MySQL a vklada\u0165 \u010di upravova\u0165 z\u00e1znamy. \u2705\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.vita.sk\/online-kurz-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=\"2026-10-23T17:08:14+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=\"Odhadovan\u00e1 doba \u010dten\u00ed\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minuty\" \/>\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-i-zaciatocnik\/\",\n\t            \"url\": \"https:\/\/www.vita.sk\/online-kurz-sql-i-zaciatocnik\/\",\n\t            \"name\": \"Online kurz SQL pre za\u010diato\u010dn\u00edkov {Y} | VITA\",\n\t            \"isPartOf\": {\n\t                \"@id\": \"https:\/\/www.vita.sk\/#website\"\n\t            },\n\t            \"primaryImageOfPage\": {\n\t                \"@id\": \"https:\/\/www.vita.sk\/online-kurz-sql-i-zaciatocnik\/#primaryimage\"\n\t            },\n\t            \"image\": {\n\t                \"@id\": \"https:\/\/www.vita.sk\/online-kurz-sql-i-zaciatocnik\/#primaryimage\"\n\t            },\n\t            \"thumbnailUrl\": \"https:\/\/www.vita.sk\/wp-content\/uploads\/2018\/10\/sql.png\",\n\t            \"datePublished\": \"2021-07-01T11:19:02+00:00\",\n\t            \"dateModified\": \"2026-10-23T17:08:14+00:00\",\n\t            \"description\": \"Online kurz SQL I. 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