if exists table drop table ORACLE 存储过程

CREATE OR REPLACE PROCEDURE DROPEXITSTABS
(TAB_NAME_IN IN varchar2) IS

v_cnt Number;
begin
select count(*)
into v_cnt
from user_tables
where table_name = upper(TAB_NAME_IN);

if v_cnt>0 then
execute immediate 'drop table ' || TAB_NAME_IN ||' purge';
end If;
end DROPEXITSTABS;

call DROPEXITSTABS('ZYWSPT-ZYWSSJJ');

create table "ZYWSPT-ZYWSSJJ"
(
ID NUMBER(20) not null,
ZBDM NVARCHAR2(20) null,
NBBSF NVARCHAR2(30) null,
SJYBSF NVARCHAR2(30) null,
SJYMC NVARCHAR2(50) null,
DY NVARCHAR2(200) null,
SJLX NVARCHAR2(10) null,
BSGS NVARCHAR2(10) null,
YXZ NVARCHAR2(200) null,
BZ NVARCHAR2(200) null,
DLZ NVARCHAR2(20) null,
DLSJ TIMESTAMP null,
GXZ NVARCHAR2(20) null,
GXSJ TIMESTAMP null,
constraint "PK_ZYWSPT-ZYWSSJJ" primary key (ID)
);