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lethal
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bronchodilator
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Bureaucracy
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Using Functions and Expressions,ate how the data is displayed, filtered, or ordered. To create expressions in T-SQL, you use functions and operators along with literal values and columns. The reasons for using expressions in T-SQL code are many. For example, you may want to display only the year of a column of the DATETIME data ty
灯丝
发表于 2025-3-25 22:15:59
Querying Multiple Tables,eries involving two or more tables. In a properly designed relational database, a table contains data about one thing or entity. For example, an order-entry application will have a table storing customer information, a table containing data about orders, and a table containing detail information abo
Fraudulent
发表于 2025-3-26 01:45:33
Grouping and Summarizing Data,tions. The previous chapter taught you how to write queries with multiple tables so that the data makes sense in applications and reports. Now it’s time to learn about a special type of query, ., used to group and summarize data. You may find that writing aggregate queries is more challenging than t
Dignant
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鞭子
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Understanding T-SQL Programming Logic, the time you will write T-SQL statements that retrieve or update data, but you can also set up loops and write code with conditional flow. Often database administrators write scripts in T-SQL to perform maintenance tasks that require more than just retrieving or updating data. For example, you migh
jaunty
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Working with XML,s for Extensible Markup Language, and it looks a lot like HTML except that it generally contains data. Companies often use XML to exchange data between incompatible systems or with their vendors and customers. SQL Server also extensively uses XML data to store query plans.
大量
发表于 2025-3-26 19:21:17
Moving Logic to the Database, new rows and updating or deleting existing rows. You can use many other objects in a SQL Server database to make your database applications more efficient and secure. This chapter teaches you how to add restrictions to tables and to create other objects that help to enforce key business rules. In t