对于每个可访问的表，授予只能运行SELECT语句的权限。
For each table that can be accessed, give permission only to run the SELECT statement.
SELECT权限可授予在表中查看数据的权限，但不授予变更数据的权限。
The SELECT permission grants authority to look at data in a table, but does not give permission to alter it.
每个可保护对象都具有可使用权限语句授予主体的权限。
Every securable object has permissions that can be granted to a principal using permission statements.
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