в 13:45, 26 мая 2010

2010-05-26T13:45:19Z

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2010-05-26T10:00:33Z

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==Intersect rowid==



<source lang="sql">

SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
2 ENAME VARCHAR2(10),
3 JOB VARCHAR2(9),
4 MGR NUMBER(4),
5 HIREDATE DATE,
6 SAL NUMBER(7, 2),
7 COMM NUMBER(7, 2),
8 DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK", 7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, "WARD", "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER", 7839, TO_DATE("2-APR-1981", "DD-MON-YYYY"), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10);
1 row created.
SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );
Table created.
SQL>
SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK");
1 row created.
SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS");
1 row created.
SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO");
1 row created.
SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON");
1 row created.
SQL>
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- -------------------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-1980 00:00:00 800 20
7499 ALLEN SALESMAN 7698 20-FEB-1981 00:00:00 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-1981 00:00:00 1250 500 30
7566 JONES MANAGER 7839 02-APR-1981 00:00:00 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-1981 00:00:00 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-1981 00:00:00 2850 30
7782 CLARK MANAGER 7839 09-JUN-1981 00:00:00 2450 10
7788 SCOTT ANALYST 7566 09-DEC-1982 00:00:00 3000 20
7839 KING PRESIDENT 17-NOV-1981 00:00:00 5000 10
7844 TURNER SALESMAN 7698 08-SEP-1981 00:00:00 1500 0 30
7876 ADAMS CLERK 7788 12-JAN-1983 00:00:00 1100 20
7900 JAMES CLERK 7698 03-DEC-1981 00:00:00 950 30
7902 FORD ANALYST 7566 03-DEC-1981 00:00:00 3000 20
7934 MILLER CLERK 7782 23-JAN-1982 00:00:00 1300 10
14 rows selected.
SQL> select * from dept;
DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
4 rows selected.
SQL>
SQL> select rowid from emp
2 intersect
3 select rowid from dept;
no rows selected
SQL>
SQL> drop table emp;
Table dropped.
SQL> drop table dept;
Table dropped.
SQL> --
</source>

==ROWID as data type==



<source lang="sql">

SQL>
SQL> CREATE TABLE MyTable(MyRow INTEGER, MyDesc VARCHAR2(50));
Table created.
SQL>
SQL> SET ECHO ON
SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
2 v_CursorID NUMBER;
3 v_SelectRecords VARCHAR2(500);
4 v_NUMRows INTEGER;
5 v_MyNum INTEGER;
6 v_MyText VARCHAR2(50);
7 v_MyROWID ROWID;
8 v_TotRow INTEGER;
9
10 BEGIN
11 v_CursorID := DBMS_SQL.OPEN_CURSOR;
12 v_SelectRecords := "SELECT * from MyTable FOR UPDATE";
13
14
15 DBMS_SQL.PARSE(v_CursorID,v_SelectRecords,DBMS_SQL.V7);
16 DBMS_SQL.DEFINE_COLUMN(v_CursorID,1,v_MyNum);
17 DBMS_SQL.DEFINE_COLUMN(v_CursorID,2,v_MyText,50);
18
19 v_NumRows := DBMS_SQL.EXECUTE(v_CursorID);
20 LOOP
21 IF DBMS_SQL.FETCH_ROWS(v_CursorID) = 0 THEN
22 EXIT;
23 END IF;
24
25 v_TOTROW := DBMS_SQL.LAST_ROW_COUNT;
26 v_MyROWID := DBMS_SQL.LAST_ROW_ID;
27 DBMS_OUTPUT.PUT_LINE("The last row count is: " || v_TOTROW || " The last ROWID is: " || v_MyROWID);
28
29 DBMS_SQL.COLUMN_VALUE(v_CursorId,1,v_MyNum);
30 DBMS_SQL.COLUMN_VALUE(v_CursorId,2,v_MyText);
31
32 DBMS_OUTPUT.PUT_LINE(v_MyNum || " " || v_MyText);
33
34 END LOOP;
35
36 EXCEPTION
37 WHEN OTHERS THEN
38 RAISE;
39
40 DBMS_SQL.CLOSE_CURSOR(v_CursorID); -- Close the cursor
41
42 END;
43 /
PL/SQL procedure successfully completed.
SQL>
SQL> drop table mytable;
Table dropped.
SQL>
SQL> --
</source>

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в 13:45, 26 мая 2010

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