NEWS for OpenSC -- History of user visible changes Complete change history is available online: http://www.opensc-project.org/opensc/timeline New in 0.12.0; 2010-12-22 * OpenSC uses a single reader driver, specified at compile time. * New card drive
一些习题,有助于加深SQL查询。 Relational algebra and SQL Query Consider the following schema of a company database: Employees(eid, ename, address, supereid) Departments(did, dname) Projects(pid, pname, did) Works_on(eid, pid, hours) (1)For each employee, find hi