SELECT 语句用于从表中提取信息。语句的一般形式为：The SELECT statement is used to pull information from a table. The general form of the statement is:

SELECT what_to_select
FROM which_table
WHERE conditions_to_satisfy;

what_to_select 表示您想查看的内容。这可以是一列列名的列表，或者使用 * 表示 “所有列。” which_table 表示您想从中检索数据的表。WHERE 子句是可选的。如果存在，conditions_to_satisfy 指定一条或多条行必须满足的条件，以便符合检索资格。what_to_select indicates what you want to see. This can be a list of columns, or * to indicate “all columns.” which_table indicates the table from which you want to retrieve data. The WHERE clause is optional. If it is present, conditions_to_satisfy specifies one or more conditions that rows must satisfy to qualify for retrieval.