The optimizer considers star join optimization when appropriate and decides on star join plan based on cost considerations in order to come up with best execution plan for a star join query.
为了实现星型连接查询的最佳执行计划，优化器在适当的时候会考虑星型连接优化，并根据成本因素来决定星型连接计划。
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
建立了圆柱分支管y型三通的主管相贯线处的周长不变的条件，确定了相贯线为椭圆。
This wellhead equipment join style for flange join, Possesses installation convenience, Tear open install rapidly, Seal up dependable, Valve's service life long feature.
本井口装置联接方式为法兰联接，具有安装方便、拆装迅速，密封可靠，阀门的使用寿命长等特点。
This wellhead equipment join style for flange join, Possesses installation convenience, Tear open install rapidly, Seal up dependable, Valve's service life long feature.
本井口装置联接方式为法兰联接，具有安装方便、拆装迅速，密封可靠，阀门的使用寿命长等特点。
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