Insert into Employees values ('Mark', 'Male') Insert into Employees values ('John', 'Male') Insert into Employees values ('Sara', 'Female') Insert into Employees values ('Valarie', 'Female') Insert into Employees values ('David', 'Male') Insert into Employees values ('Ellie', 'Female...
Blog.objects.values().order_by('id') Blog.objects.order_by('id').values() Django 的作者喜欢将影响SQL 的方法放在前面,然后放置影响输出的方法(例如values()),但是实际上无所谓。这是卖弄你个性的好机会。 你可以通过OneToOneField、ForeignKey 和 ManyToManyField 属性反向引用关联的模型的字段: Blog.objects....
In a data map, maps list values from the source file to Microsoft Dynamics 365.MessagesThe following table lists the messages for the List Value Mapping (PickListMapping) table. Messages represent operations that can be performed on the table. They may also be events....
ruby实现 ids=[635,511,580]order_ids=[]ids.each_with_index{|id,index|order_ids<<"(#{id},#{index+1})"}# order_ids => "(635, 1),(511, 2),(580, 3)"City.connection.execute("select cities.id,cities.cn from cities join(values#{order_ids}) as x (id,ordering) on cities.id ...
前几天在生产环境抓到一条慢SQL,内容大致如下: selectxxxfromtablewhereconditionsandidin(in_list); 这个SQL看起来貌似没有什么问题,但是in_list的元素个数多达3000多个,然后我尝试统计了这个表的总数据量,刚好跟这个in_list吻合,用大腿猜了下,应该是用了框架,先查出表里所有的数据放入list,再进行拼接生成的SQL,...
* 如果动态数组为 empty 则不会进行 sql 拼接 * * @param condition 执行条件 * @param column 字段 * @param values 数据数组 * @return children */ default Children in(boolean condition, R column, Object... values) { return in(condition, column, Arrays.stream(Optional.ofNullable(values...
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然而,在动态SQL中,可以提供%INLIST谓词值作为单个主机变量; 必须将IN谓词值作为单独的主机变量提供。 因此,更改IN谓词值的数量将导致创建一个单独的缓存查询。 更改%INLIST谓词值的数量不会导致创建单独的缓存查询。 示例 下面的示例将Home_State列值与新英格兰北部州的结构化列表的元素匹配: ...
第十一章 SQL谓词 %INLIST 将一个值匹配到%List结构化列表中的元素。 大纲 参数 scalar-expression - 将其值与列表元素进行比较的标量表达式(...