UPDATE(SELECTp.person_id,p.account_numberASperson_account_number,a.account_numberFROMperson pINNERJOINaccountaONp.person_id=a.person_id)subSETsub.person_account_number=sub.account_number; The Select query inside the Update statement looks up the two tables and constructs the right data set to u...
Yet, on occasion, it may prove beneficial toalter the contents of a tableindirectly, by using a subset of data obtained from secondary query statement. 但是,有时候,通过使用从辅助查询语句获得的数据子集,来间接更改表的内容可能被证明是有益的。 Performing anUPDATEusing a secondarySELECTstatementcan be...
SQL命令 UPDATE(四) 示例 本节中的示例更新SQLUser.MyStudents表。 下面的示例创建SQLUser.MyStudents表,并用数据填充它。 因为这个示例的重复执行会积累具有重复数据的记录,所以它使用TRUNCATE TABLE在调用INSERT之前删除旧数据。 在调用UPDATE示例之前执行这个示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释...
Yet, on occasion, it may prove beneficial to alter the contents of a table indirectly, by using a subset of data obtained from secondary query statement. Performing an UPDATE using a secondary SELECT statement can be accomplished in one of two ways, primarily depending upon which version of ...
第八十二章 SQL命令 UPDATE(一) 为指定表中的指定列设置新值。 大纲 UPDATE [%keyword] table-ref [[AS] t-alias] value-assignment-statement [FROM [optimize-option] select-table [[AS] t-alias] {, select-table2 [[AS] t-alias]} ] [WHERE condition-expression] UPDATE [%keyword] table-ref ...
来源:http://www.aimks.com/sql-update-the-select-statement-application.html QL update select语句 最常用的update语法是: UPDATE TABLE_NAME SET column_name1 = VALUE
1 Statement st = conn.createStatement(); 2 String sql = “select * from user where id=1; 3 ResultSet rs = st.executeUpdate(sql); 4 while(rs.next()){ 5 //根据获取列的数据类型,分别调用rs的相应方法映射到java对象中 6 } 1.
(User.id > 15).order_by(User.id.desc()).all() #查找表里id大于15的数据,以id排序desc()降序 print(ret) ret = session.query(User.id,, User.password,User.fullname).from_statement(text("SELECT * FROM users where name = '林贵秀2'")).all() #查询表里ame = '林贵秀2'的数据 print(...
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ClassMethod Update6() { s studentupdate=3 s studentupdate(1)="UPDATE (SELECT StudentName FROM SQLUser.MyStudents " s studentupdate(2)="WHERE StudentAge IS NULL OR StudentAge > 21) " s studentupdate(3)="SET StudentName = StudentName||' *** CHECK DOB' " s tStatement = ##class(%...