Erlang中的模式匹配还会处理各个语句的执行流，以及从复合数据类型(元组、数组)中提取出值。
Pattern matching in Erlang also handles the execution flow of individual statements, and extracts the individual vales from compound data types (tuples, arrays).
正如在前一篇文章中所看到的，YQL允许您使用select语句提取来自第三方web服务的数据。
As you saw in the previous article, YQL lets you extract data from third-party web services with SELECT statements.
例如你可以从一个表格中提取数据，导出为excel表格或者SQL语句，在OutwitHub中只需要几次点击就可以了。
You can for example extract the data from a table and export it as excel spreadsheet or as SQL statements in just a few clicks from within Outwit Hub.
注意，在这里仅提取单个表中的数据，但是，您可以在这些sql语句中使用与Derby提供的一样复杂的功能。
Note that here I'm just pulling data from a single table, but you can get as complex as Derby will allow in these SQL statements.
select语句的FROM组件指明将从哪个表(或多个表)中提取数据。
The from component of a SELECT statement indicates from which table (or multiple tables) the data will be extracted.
本文介绍了select语句，并展示了如何恰当地将它与ApacheDerby结合使用来选择和提取数据库中的数据。
This article introduced the select statement and demonstrated how to use it properly with Apache Derby to select and extract data from a database.
db2look工具能够从一个数据库中提取数据定义语言 (DDL)语句，以便在测试数据库中复制产品数据库的数据库对象。
The db2look tool can extract data definition language (DDL) statements from a database in order to reproduce the database objects of a production database on a test database.
IBMDataMovementTool会生成一个表名。tables文件，其中为每一个数据库表指定一条select语句，从而指明了需要从源数据库提取哪些数据。
The IBM data Movement Tool produces a table name.tables file that states which data to extract from the source database by specifying a SELECT query per database table.
联邦数据库提取sql语句，将它转换成有效的oracle语法，并传递到Oracle数据库上进行处理。
The federated database simply takes the SQL statement, translates it into valid Oracle syntax and passes it onto the Oracle database for processing.
清单8演示如何从XML中提取出customerid并用它创建更新数据库的sql语句。
Listing 8 shows how to extract the customerid from the XML and use it to create an update SQL command for the database.
sql语句可以用来执行各种各样的操作，例如更新数据库中的数据，从数据库中提取数据等。
SQL statements can be used to perform various operations, such as updating data in the database, extract data from the database and so on.
PDO并不提供数据提取，它不会重写SQL语句，或者模仿这些功能。
PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features.
PDO并不提供数据提取，它不会重写SQL语句，或者模仿这些功能。
PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features.
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