{"id":75,"date":"2026-03-06T06:24:04","date_gmt":"2026-03-06T06:24:04","guid":{"rendered":"https:\/\/gigz.pk\/sql\/?post_type=lesson&#038;p=75"},"modified":"2026-03-16T18:50:18","modified_gmt":"2026-03-16T18:50:18","slug":"string-functions","status":"publish","type":"lesson","link":"https:\/\/gigz.pk\/sql\/lesson\/string-functions\/","title":{"rendered":"\u00a0String Functions"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">String functions are tools used to manipulate, analyze, or transform text data. They are widely used in programming, data analysis, and web development. Understanding these functions can help you handle text efficiently and improve website functionality.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common String Functions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Length<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Measures the number of characters in a string.<br><strong>Example:<\/strong><br><code>length(\"Hello\")<\/code> \u2192 5<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Concatenate<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Joins two or more strings together.<br><strong>Example:<\/strong><br><code>concat(\"Hello\", \" World\")<\/code> \u2192 &#8220;Hello World&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Uppercase and Lowercase<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Converts all letters in a string to uppercase or lowercase.<br><strong>Example:<\/strong><br><code>uppercase(\"hello\")<\/code> \u2192 &#8220;HELLO&#8221;<br><code>lowercase(\"HELLO\")<\/code> \u2192 &#8220;hello&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Substring<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Extracts a part of a string based on starting and ending positions.<br><strong>Example:<\/strong><br><code>substring(\"Hello World\", 0, 5)<\/code> \u2192 &#8220;Hello&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Trim<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Removes spaces from the beginning and end of a string.<br><strong>Example:<\/strong><br><code>trim(\" Hello \")<\/code> \u2192 &#8220;Hello&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Replace<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Replaces specified text with new text within a string.<br><strong>Example:<\/strong><br><code>replace(\"Hello World\", \"World\", \"There\")<\/code> \u2192 &#8220;Hello There&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. Find \/ IndexOf<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Finds the position of a character or substring within a string.<br><strong>Example:<\/strong><br><code>indexOf(\"Hello World\", \"World\")<\/code> \u2192 6<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8. Split<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Divides a string into an array of smaller strings using a separator.<br><strong>Example:<\/strong><br><code>split(\"apple,banana,cherry\", \",\")<\/code> \u2192 [&#8220;apple&#8221;, &#8220;banana&#8221;, &#8220;cherry&#8221;]<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Best Practices<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always check for null or empty strings to avoid errors.<\/li>\n\n\n\n<li>Use string functions in combination for more complex text manipulation.<\/li>\n\n\n\n<li>Remember that some functions may be case-sensitive.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Mastering string functions allows you to process text efficiently, validate input, and improve user experience on your website. Practice using these functions in real examples to become comfortable with their behavior.<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773566881292\"><strong class=\"schema-faq-question\"><\/strong> <p class=\"schema-faq-answer\"><\/p> <\/div> <\/div>\n\n\n<div class=\"yoast-breadcrumbs\"><span><span><a href=\"https:\/\/gigz.pk\/sql\/\">Home<\/a><\/span> \u00bb <span class=\"breadcrumb_last\" aria-current=\"page\">SQL Foundations Program (SQL-101) > Working with Functions > String Functions<\/span><\/span><\/div>","protected":false},"menu_order":23,"template":"","class_list":["post-75","lesson","type-lesson","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00a0String Functions - SQL Learning Hub<\/title>\n<meta name=\"description\" content=\"&quot;Learn essential string functions to manipulate, analyze, and process text efficiently in programming and web development.&quot;\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gigz.pk\/sql\/lesson\/string-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00a0String Functions - 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