{"id":2150,"date":"2019-06-15T19:56:38","date_gmt":"2019-06-16T02:56:38","guid":{"rendered":"https:\/\/oracletutorial.com\/?page_id=2150"},"modified":"2025-04-24T07:52:40","modified_gmt":"2025-04-24T14:52:40","slug":"oracle-dump","status":"publish","type":"page","link":"https:\/\/www.oracletutorial.com\/oracle-string-functions\/oracle-dump\/","title":{"rendered":"Oracle DUMP Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the Oracle <code>DUMP()<\/code> function to find the data type, length, and internal representation of an expression.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-oracle-dump-function'>Introduction to Oracle DUMP() function <a href=\"#introduction-to-oracle-dump-function\" class=\"anchor\" id=\"introduction-to-oracle-dump-function\" title=\"Anchor for Introduction to Oracle DUMP() function\">#<\/a><\/h2>\n\n\n\n<p>The Oracle <code>DUMP()<\/code> function allows you to find the <a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-data-types\/\">data type<\/a>, length, and internal representation of a value.<\/p>\n\n\n\n<p>The following illustrates the syntax of the <code>DUMP()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DUMP ( expression &#91;, return_format] &#91;, start_position] &#91;, length] )<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='arguments'>Arguments <a href=\"#arguments\" class=\"anchor\" id=\"arguments\" title=\"Anchor for Arguments\">#<\/a><\/h2>\n\n\n\n<p>The <code>DUMP()<\/code> function takes four arguments<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='expression'>expression <a href=\"#expression\" class=\"anchor\" id=\"expression\" title=\"Anchor for expression\">#<\/a><\/h3>\n\n\n\n<p>Specifies an expression to be evaluated. It can be a column or an expression.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='return_format'>return_format <a href=\"#return_format\" class=\"anchor\" id=\"return_format\" title=\"Anchor for return_format\">#<\/a><\/h3>\n\n\n\n<p>Determines the format of the returned value. The return_format accepts one of the following values:<\/p>\n\n\n\n<p>If you don&#8217;t specify the <code>return_format<\/code>, the <code>DUMP()<\/code> function will return the internal representation of the expression in decimal format (or 10).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='start_position'>start_position <a href=\"#start_position\" class=\"anchor\" id=\"start_position\" title=\"Anchor for start_position\">#<\/a><\/h3>\n\n\n\n<p>Specifies the starting position in the expression for which to return the internal representation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='length'>length <a href=\"#length\" class=\"anchor\" id=\"length\" title=\"Anchor for length\">#<\/a><\/h3>\n\n\n\n<p>Specifies the length, of the <code>start_position<\/code>, in the expression for which to return the internal representation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='return-value'>Return value <a href=\"#return-value\" class=\"anchor\" id=\"return-value\" title=\"Anchor for Return value\">#<\/a><\/h2>\n\n\n\n<p>The <code>DUMP()<\/code> function returns a value of <code><a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-varchar2\/\">VARCHAR2<\/a><\/code> type. If the expression is NULL, the <code>DUMP()<\/code> function will return NULL.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='examples'>Examples <a href=\"#examples\" class=\"anchor\" id=\"examples\" title=\"Anchor for Examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>DUMP()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='basic-oracle-dump-function-examples'>Basic Oracle DUMP() function examples <a href=\"#basic-oracle-dump-function-examples\" class=\"anchor\" id=\"basic-oracle-dump-function-examples\" title=\"Anchor for Basic Oracle DUMP() function examples\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>DUMP()<\/code> function to display the type, length, and internal representation of the string <code>'Oracle DUMP'<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    DUMP(<span class=\"hljs-string\">'Oracle DUMP'<\/span>) <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-keyword\">result<\/span>\n<span class=\"hljs-keyword\">FROM<\/span> \n    DUAL; \n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the result:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">RESULT                                           \n<span class=\"hljs-comment\">--------------------------------------------------<\/span>\nTyp=96 Len=11: 79,114,97,99,108,101,32,68,85,77,80\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The Typ=96: 96 denotes the <code><a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-char\/\">CHAR<\/a><\/code> data type. (<a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-data-types\/\">See the table for the mapping of the internal numbers and their corresponding data types<\/a>)<\/li>\n\n\n\n<li>Len=11: the length of the string is 11.<\/li>\n\n\n\n<li>79,114,97,99,108,101,32,68,85,77,80 is the decimal (or <a href=\"https:\/\/www.oracletutorial.com\/oracle-string-functions\/oracle-ascii\/\">ASCII<\/a>) representation of the string <code>'Oracle DUMP'<\/code> e.g., ASCII of O is 79, r is 114, and so on.<\/li>\n<\/ul>\n\n\n\n<p>To display the actual characters of the string, you use the format 17:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    DUMP(<span class=\"hljs-string\">'Oracle DUMP'<\/span>,<span class=\"hljs-number\">17<\/span>) <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-keyword\">result<\/span>\n<span class=\"hljs-keyword\">FROM<\/span> \n    DUAL; <\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">RESULT                             \n<span class=\"hljs-comment\">------------------------------------<\/span>\nTyp=96 Len=11: O,r,a,c,l,e, ,D,U,M,P\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='using-oracle-dump-function-with-table-data-example'>Using Oracle DUMP() function with table data example <a href=\"#using-oracle-dump-function-with-table-data-example\" class=\"anchor\" id=\"using-oracle-dump-function-with-table-data-example\" title=\"Anchor for Using Oracle DUMP() function with table data example\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>DUMP()<\/code> function to show the data type, length, and internal representation of the customer names from the <code>customers<\/code> table:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"145\" src=\"https:\/\/www.oracletutorial.com\/wp-content\/uploads\/2017\/07\/customers-table.png\" alt=\"customers table\" class=\"wp-image-298\"\/><\/figure>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">name<\/span>, \n    DUMP(<span class=\"hljs-keyword\">name<\/span>) <span class=\"hljs-keyword\">result<\/span>\n<span class=\"hljs-keyword\">FROM<\/span> \n    customers\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    <span class=\"hljs-keyword\">name<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>This picture illustrates the partial result set:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"908\" height=\"261\" src=\"https:\/\/www.oracletutorial.com\/wp-content\/uploads\/2019\/06\/Oracle-DUMP-function-example.png\" alt=\"Oracle DUMP function example\" class=\"wp-image-2151\" srcset=\"https:\/\/www.oracletutorial.com\/wp-content\/uploads\/2019\/06\/Oracle-DUMP-function-example.png 908w, https:\/\/www.oracletutorial.com\/wp-content\/uploads\/2019\/06\/Oracle-DUMP-function-example-300x86.png 300w, https:\/\/www.oracletutorial.com\/wp-content\/uploads\/2019\/06\/Oracle-DUMP-function-example-768x221.png 768w\" sizes=\"auto, (max-width: 908px) 100vw, 908px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the 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