The advantage of recursive programming is that it is very easy to write and it only requires very few lines of code if done correctly.Structured query language(SQL)is a database language and is used to manipulate data...The advantage of recursive programming is that it is very easy to write and it only requires very few lines of code if done correctly.Structured query language(SQL)is a database language and is used to manipulate data.In Microsoft SQL Server 2000,recursive queries are implemented to retrieve data which is presented in a hierarchical format,but this way has its disadvantages.Common table expression(CTE)construction introduced in Microsoft SQL Server 2005 provides the significant advantage of being able to reference itself to create a recursive CTE.Hierarchical data structures,organizational charts and other parent-child table relationship reports can easily benefit from the use of recursive CTEs.The recursive query is illustrated and implemented on some simple hierarchical data.In addition,one business case study is brought forward and the solution using recursive query based on CTE is shown.At the same time,stored procedures are programmed to do the recursion in SQL.Test results show that recursive queries based on CTEs bring us the chance to create much more complex queries while retaining a much simpler syntax.展开更多
Bugs have long embodied that from which we seek protection. Whether a mild irritant （a ＂fly in the ointment＂）, a costly pest to gardeners （＂bug of W＂）, or a destructive force of Biblical proportions （a swarm ...Bugs have long embodied that from which we seek protection. Whether a mild irritant （a ＂fly in the ointment＂）, a costly pest to gardeners （＂bug of W＂）, or a destructive force of Biblical proportions （a swarm of locusts）, bugs are nature＇s warning of approaching death. This paper investigates the natura morta canvas during the Golden Age of Dutch art, focusing on how these symbols of natural evil work to enliven the visual rhetoric of the still-life as they invite spiritual contemplation. In religious-themed art, we intuitively recognize these morbid creatures as symbols of decay encroaching on domestic scenes filled with food and cut flowers. Emphasizing the short life of these perishables, bugs embody a classic tension and its dichotomous variations： the corporeal vs. the spiritual, earth vs. heaven, and sin vs. redemption. Though ostensibly a peripheral feature of the natura morta, bugs are a decidedly central motif that reflects the viewer＇s struggle with sin： Is it repellent, attractive, or repellently attractive？ This study will concern the visual rhetoric of flies, dragonflies, and bees in the works of Osias Beert, Ambrosius Bosschaert, and Georg Flegel, with an emphasis on the beasts of the devil as icons of Dutch art.展开更多
文摘The advantage of recursive programming is that it is very easy to write and it only requires very few lines of code if done correctly.Structured query language(SQL)is a database language and is used to manipulate data.In Microsoft SQL Server 2000,recursive queries are implemented to retrieve data which is presented in a hierarchical format,but this way has its disadvantages.Common table expression(CTE)construction introduced in Microsoft SQL Server 2005 provides the significant advantage of being able to reference itself to create a recursive CTE.Hierarchical data structures,organizational charts and other parent-child table relationship reports can easily benefit from the use of recursive CTEs.The recursive query is illustrated and implemented on some simple hierarchical data.In addition,one business case study is brought forward and the solution using recursive query based on CTE is shown.At the same time,stored procedures are programmed to do the recursion in SQL.Test results show that recursive queries based on CTEs bring us the chance to create much more complex queries while retaining a much simpler syntax.
文摘Bugs have long embodied that from which we seek protection. Whether a mild irritant （a ＂fly in the ointment＂）, a costly pest to gardeners （＂bug of W＂）, or a destructive force of Biblical proportions （a swarm of locusts）, bugs are nature＇s warning of approaching death. This paper investigates the natura morta canvas during the Golden Age of Dutch art, focusing on how these symbols of natural evil work to enliven the visual rhetoric of the still-life as they invite spiritual contemplation. In religious-themed art, we intuitively recognize these morbid creatures as symbols of decay encroaching on domestic scenes filled with food and cut flowers. Emphasizing the short life of these perishables, bugs embody a classic tension and its dichotomous variations： the corporeal vs. the spiritual, earth vs. heaven, and sin vs. redemption. Though ostensibly a peripheral feature of the natura morta, bugs are a decidedly central motif that reflects the viewer＇s struggle with sin： Is it repellent, attractive, or repellently attractive？ This study will concern the visual rhetoric of flies, dragonflies, and bees in the works of Osias Beert, Ambrosius Bosschaert, and Georg Flegel, with an emphasis on the beasts of the devil as icons of Dutch art.
