/* 这是注释 */ SELECT column1, column2 FROM table_name; 这将使注释被视为普通的文本,而不是SQL语句的一部分。 检查SQL语法:确保您的SQL语句符合标准语法规则。如果存在语法错误,可能会导致解析错误或执行失败。您可以使用在线SQL语法检查工具(如https://www.w3schools.com/sql/trysql.asp)来验证您的SQL语...
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- definition of simple elements --> <xs:element name="orderperson" type="xs:string"/> <xs:element name="name" type="xs:string"/> <xs:element name="address" type="xs:string"/> <xs:element name="city" type="xs:stri...
XML Schema has a lot of built-in data types. The most common types are: xs:string xs:decimal xs:integer xs:boolean xs:date xs:time Example Here is an XML element with an attribute: <lastnamelang="EN">Smith</lastname> And here is the corresponding attribute definition: ...
This is really interesting because by the schema (the datatype), you can specify the type of value and then describe the form for this type of value like CRUD for the SQL table. There is an excellent package in jquery that will help you for that:https://github.com/jdorn/json-editor/...
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<xs:element name="heading" type="xs:string"> the element "heading" is of type string <xs:element name="body" type="xs:string"> the element "body" is of type string XML Schemas are More Powerful than DTD XML Schemas are written in XML ...
The <sequence> indicator specifies that the child elements must appear in a specific order: <xs:elementname="person"> <xs:complexType> <xs:sequence> <xs:elementname="firstname"type="xs:string"/> <xs:elementname="lastname"type="xs:string"/> ...
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XML Schema choice element allows only one of the elements contained in the <choice> declaration to be present within the containing element. Element Information Parent elements:group, choice, sequence, complexType, restriction (both simpleContent and complexContent), extension (both simpleContent and comp...
XML Schema has a lot of built-in data types. The most common types are: xs:string xs:decimal xs:integer xs:boolean xs:date xs:time Example Here are some XML elements: <lastname>Refsnes</lastname> <age>36</age> <dateborn>1970-03-27</dateborn> ...