ORACLE(使用 SQL 开发人员)。我需要正确构造 EXECUTE IMMEDIATE 语句。我没有“创造”特权。任务是获取每个日期每个表格的行数,以获取表格/日期的动态列表。我有以下内容:
DECLARE CURSOR cur_table_name IS SELECT TABLE_NAME
FROM ALL_TABLES WHERE TABLE_NAME IN ('table_a', 'table_b', 'table_c');
CURSOR cur_BEGIN_DATE IS
select to_date('2014-09-25 00:00:00', 'YYYY-MM-DD HH24:MI:SS') + rownum -1 AS BEGIN_DATE,
to_date('2014-09-26 00:00:00', 'YYYY-MM-DD HH24:MI:SS') + rownum -1 AS END_DATE from dual
Connect by level <= to_date('2014-09-30 00:00:00', 'YYYY-MM-DD HH24:MI:SS') - to_date('2014-09-25 00:00:00', 'YYYY-MM-DD HH24:MI:SS') + 1;
var_total_rows NUMBER(15);
var_table_name VARCHAR2 (50);
var_bgn_date DATE;
var_end_date DATE;
BEGIN
OPEN cur_TABLE_NAME;
LOOP
FETCH cur_TABLE_NAME INTO var_table_name;
EXIT WHEN cur_TABLE_NAME%NOTFOUND;
--testing output
DBMS_OUTPUT.PUT_LINE ('Table: '|| var_table_name);
var_total_rows :=0;
OPEN cur_BEGIN_DATE;
LOOP
FETCH cur_BEGIN_DATE INTO var_bgn_date, var_end_date;
EXIT WHEN cur_BEGIN_DATE%NOTFOUND;
--TESTING OUTPUT
DBMS_OUTPUT.PUT_LINE ('DATES ARE: ' || var_bgn_date || ', ' ||var_end_date|| ' Table IS: '||var_table_name);
--------THIS IS THE NOT WORKING STATEMENT DUE TO VARIABLES IN THE WHERE STATEMENT:
execute immediate 'SELECT COUNT(*) FROM '||var_table_name || ' where DTM >= '|| var_bgn_date ||' and DTM < '||var_end_date INTO var_total_rows;
DBMS_OUTPUT.PUT_LINE (var_table_name||' '||var_bgn_date||' '||var_end_date ||' '||var_total_rows);
END LOOP;
CLOSE cur_BEGIN_DATE;
END LOOP;
CLOSE cur_TABLE_NAME;
结尾;
如果我从 where 语句中删除变量(只需执行 'Select * from || var_table_name into var_total_rows; )这有效。如果 where 子句中有一个静态值 - 它可以工作(但循环使用相同的日期,我需要更改日期!)。但是我不能使语法适用于 where 子句中的动态变量。这可以做到吗?
感谢你的帮助!