通过if子句创建脚本的问题

Question

我们正在尝试构建一个脚本，该脚本将自动检查是否已创建表，如果已创建，则脚本应结束。如果未创建表，则脚本应创建该表。

    case 
    if select count( *) from ALL_TAB_COLS where table_name = 'GPS_TRACKER_DATA' = 0 then
    create table AZUBI.GPS_TRACKER_DATA as select * from KAKATEL.GPS_POSITION
    else END

这是我们得到的错误

    Error starting at line : 3 in command -
    create table FEZ.GPS_TRACKER_DATA as select * from KAKATEL.GPS_POSITION
    else END
    Error report -
    ORA-00933: SQL command not properly ended
    00933. 00000 -  "SQL command not properly ended"
    *Cause:    
    *Action:

Answer 1

DECLARE
    V_CNT   NUMBER := 0;
BEGIN
    SELECT
        COUNT(*)
    INTO V_CNT
    FROM
        ALL_TABLES
    WHERE
        TABLE_NAME = 'GPS_TRACKER_DATA'
        AND OWNER = 'AZUBI';

    IF V_CNT = 0 THEN
        EXECUTE IMMEDIATE 'create table AZUBI.GPS_TRACKER_DATA as 
                           select * from KAKATEL.GPS_POSITION';
    END IF;
END;
/

欢呼!!

Answer 2

declare
   v_cnt pls_integer;
begin
    select count(*) into v_cnt from ALL_TAB_COLS where table_name = 'GPS_TRACKER_DATA';
    if v_cnt = 0 then
    execute immediate 'create table AZUBI.GPS_TRACKER_DATA as select * from KAKATEL.GPS_POSITION';
    end if;
end;
/

对于PL / SQL块中的DDL语句，您需要execute immediate。