2.AST转换为QB(查询块) JOIN以后的对象还是AST存储qbp,join以前的aliasToSubq aliases 里面存储 3.QB转OperatorTree(操作树 逻辑执行树) TS SEL GBY RS FIL FS 逻辑执行的优化 Rule定义:R1(TS) R2[RS] R3[FIL] .startwork 如果符合上面定义的规则,才对树进行操作 or换成in where(struct用法拆出来分区字...
Java Logical OR Operator - Learn about the Java Logical OR operator, its syntax, usage, and examples to enhance your programming skills.
6、NOT 操作符 : 否定他之后所跟的条件 注意:MySQL中支持使用not 对 in、between 和exists 子句取反,与其他DBMS允许使用NOT 对各种条件取反有很大的差别。 --查询价格不是2.5 和 10 的商品selectprod_name,vend_id,prod_pricefromproductswhereprod_pricenotin(2.5,10)orderbyprod_price;...
Compare Enum Using the==Operator in Java The==(equal) operator is a binary operator that requires two operands. It compares the operands and returns eithertrueorfalse. We can use this to compare enum values. See the example below.
mongoTemplate的api文档 mongodb spring java 字段 java MongoTemplate常用参数 mongotemplate文档 (一)、Spring Data 概述 Spring Data : Spring 的一个子项目。用于简化数据库访问,支持NoSQL 和 关系数据存储。其主要目标是使数据库的访问变得方便快捷。● SpringData 项目所支持 NoSQL 存储: MongoDB (文档数据库)...
The logical “OR” operator in Python returns the boolean value “True” when any operand’s value is “True”. We can specify multiple conditions using the “OR” operator, which returns either “True or False”. When either of the operand values is “True”, the “OR” operator returns...
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|= performs an in-place operation (原地运算符) between pairs of objects. In particular, between: sets: a union operation dicts: an update operation counters: a union (of multisets) operation numbers: a bitwise OR, binary operation In most cases, it is related to the | operator. See examp...
另,可参见: 1.http://blog.csdn.net/llhhyy1989/article/details/12571111 2.http://blog.csdn.net/mydeman/article/details/6652387 3.http://docs.mongodb.org/manual/reference/operator/query/查询命令,$ne,$in
而不是编写另一个条件，然后使用OrOperator。