摘要：
Q:What is the difference between count(1) and count(*) in a sql queryeg.select count(1) from emp; andselect count(*) from emp;A:nothing, they are the same, incur the same amount of work -- do the same thing, take the same amount of resources.You can see this via:ops$tkyte@ORA817.US.ORACLE.COM> al 阅读全文
