如何在Oracle SQL中使用已声明的参数过滤SQL查询

Question

I have a Oracle SQL script and would like to pass input parameter to the script for execution. How would I achieve this?

Say I have date parameter testdate. This is how we do it in sql server

declare @testdate as date

select * from test where testdate=@testdate

Basically I have set of sql statements in a block which needs to be executed.

Answer 1

You can pass it as an argument to the SQL script and invoke it in SQL*Plus.

For example,

I have a script emp.sql which looks like -

select ename from emp where empno=&1

Now, I will invoke it in SQL*Plus passing the empno as an argument.

SQL> @D:\emp.sql 7369
old   1: select ename from emp where empno=&1
new   1: select ename from emp where empno=7369

ENAME
----------
SMITH

SQL>

Similarly, for a date argument -

SQL> @D:\emp.sql sysdate
old   1: select ename from emp where hiredate<=&1
new   1: select ename from emp where hiredate<=sysdate

ENAME
----------
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS

ENAME
----------
JAMES
FORD
MILLER

14 rows selected.

SQL>

For string type, you need to have single-quotation marks. For example -

SQL> @D:\emp.sql SCOTT
old   1: select empno from emp where ename='&1'
new   1: select empno from emp where ename='SCOTT'

     EMPNO
----------
      7788

SQL>