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SQL Server:DROP INDEX table_name.index_name; DB2/Oracle:DROP INDEX index_name; MySQL:ALTER TABLE table_nameDROP INDEX index_name; Exercise? What is the purpose of the SQL CREATE INDEX statement? To create a backup of a table To retrieve data more quickly by creating indexes To ensure ...
function myFunction() { document.getElementById("myDropdown").classList.toggle("show");} // Close the dropdown menu if the user clicks outside of it window.onclick = function(event) { if (!event.target.matches('.dropbtn')) { var dropdowns = document.getElementsByClassName("dropdown-...
Create aNumberstable; here's aSOquestion on the subject. Let's call itdbo.Number.SQL Server 20...
Data processed and returned by a function is typically stored in variables: lowered = lower$ ("THIS FUNCTION CONVERTS TEXT TO LOWERCASE.") print lowered In some cases the output (return value) of one function can be used directly as the input of another function: print lower$ ("THIS ...
, "helpUrl": "http://www.w3schools.com/jsref/jsref_length_string.asp" } 两个示例都加载相同的 'string_length' 块。在Web 上,使用 initJson 函数加载 JSON 格式。这也允许在 Blockly 网页中混合使用这两种格式。最好尽可能使用 JSON 定义块,并仅将 JavaScript 用于 JSON 不支持的块定义部分。下面是...
Exercise: SQL Create TableWhat is the primary purpose of the SQL CREATE TABLE statement?To create a new table in a database To insert data into a table To join a table To delete a table from a databaseSubmit Answer » What is an Exercise? Test what you learned in the chapter: ...
SQL Updating a View A view can be updated with theCREATE OR REPLACE VIEWstatement. SQL CREATE OR REPLACE VIEW Syntax CREATEORREPLACEVIEWview_nameAS SELECTcolumn1,column2, ... FROMtable_name WHEREcondition; The following SQL adds the "City" column to the "Brazil Customers" view: ...
function char($parser,$data) {echo $data;} xml_set_character_data_handler($parser,"char");$fp=fopen("note.xml","r"); while ($data=fread($fp,4096)) { // Parse XML data xml_parse($parser,$data,feof($fp)) or die (sprintf("XML Error: %s at line %d", xml_error_string(xm...
The SQL CREATE DATABASE Statement TheCREATE DATABASEstatement is used to create a new SQL database. Syntax CREATEDATABASEdatabasename; The following SQL statement creates a database called "testDB": ExampleGet your own SQL Server CREATEDATABASEtestDB; ...