ORACLE的SQL集锦

1. 一张自关联的表，查询的结果集要求先显示父数据，再显示其子数据。其中下面语句中的-1就是父数据

SELECT A.* FROM XT_NOSAFE_VINDI A START WITH A.PARENT_CODE='-1'CONNECT BY PRIOR A.FACTOR_CODE=A.PARENT_CODE ORDER SIBLINGS BY A.FACTOR_CODE

结果集：
1  粉尘类  0001  -1
2  游离二氧化硅粉尘  4001  0001
3  煤尘(包括煤矽尘)  4002  0001
4  石棉粉尘  4003  0001
5  其它粉尘  4004  0001
6  棉尘(包括亚麻、软大麻、黄麻粉尘)  4005  0001
7  放射性物质类  0002  -1
8  射线  3001A  0002
9  化学物质类  0003  -1
10  铅及其无机化合物  1001  0003
11  四乙基铅  1002  0003
12  汞及其无机化合物  1003  0003
13  铍及其无机化合物  1004  0003
14  镉及其无机化合物  1005  0003
15  铬及其无机化合物  1006  0003

2. WM_CONCAT以及LISTAGG用法，其中建议使用LISTAGG，其效率高。

 SELECT A.DESMTD_ID, WM_CONCAT(A.RID)        FROM BX_SELRST_BE A WHERE A.REPSUB_ID IN(201258,201279)        GROUP BY A.DESMTD_ID SELECT A.DESMTD_ID, LISTAGG(A.RID,',')         WITHIN GROUP (ORDER BY A.DESMTD_ID) ALL_FORMS        FROM BX_SELRST_BE A WHERE A.REPSUB_ID IN(201258,201279)          GROUP BY A.DESMTD_ID

3. 创建JOB

CREATE OR REPLACE PROCEDURE PRO_CHG_NETTAG(VAL_ IN VARCHAR2) ISBEGINUPDATE TS_SYSTEM_PARAM SET PARAM_VALUE=VAL_ WHERE PARAM_NAME='VERIFYCODE_NETTAG';COMMIT;END PRO_CHG_NETTAG;/--每天早上一点DECLARE JOB_CHG_NET1 NUMBER;BEGINDBMS_JOB.SUBMIT(JOB_CHG_NET1,'PRO_CHG_NETTAG(3);',TRUNC(SYSDATE+1)+1/24, 'TRUNC(SYSDATE+1)+1/24');END;/--每天早上7点DECLARE JOB_CHG_NET2 NUMBER;BEGINDBMS_JOB.SUBMIT(JOB_CHG_NET2,'PRO_CHG_NETTAG(1);',TRUNC(SYSDATE+1)+7/24, 'TRUNC(SYSDATE+1)+7/24');END;/

4.行转列

SELECT * FROM (SELECT ORGIDX, GDSIDX, STM_CNT FROM TD_JXC_CNTSTM_INFO) TPIVOT (SUM(STM_CNT) FOR GDSIDX IN (202,301,402,3)) ORDER BY ORGIDX;     ORGIDX  202  301  402  31  1  0  0    13612  655480        43  655482  1000  720  1046  4  700099  21400  11080  10954  6455  700381  600      6  35197450        49000SELECT ORGIDX,GDSIDX, SUM(STM_CNT) FROM TD_JXC_CNTSTM_INFO WHERE GDSIDX IN (202,301,402,3)GROUP BY ORGIDX,GDSIDXORDER BY ORGIDX     ORGIDX  GDSIDX  SUM(STM_CNT)1  1  3  13612  1  202  03  1  301  04  655480  3  45  655482  202  10006  655482  301  7207  655482  402  10468  700099  3  6459  700099  202  2140010  700099  301  1108011  700099  402  1095412  700381  202  60013  35197450  3  49000

5. 获取日期所在周

SELECT TO_CHAR(TO_DATE('2013-12-31','YYYY-MM-DD'), 'IYYY-IW') FROM DUAL

6. 根据某列分组，并获取其中rid最大的

MAX(A.IDX) OVER(PARTITION BY A.UNIT_ID)

7.限制允许IP访问设置

在ORACLE\PRODUCT\10.2.0\DB_1\NETWORK\ADMIN\SQLNET.ORA最后添加TCP.VALIDNODE_CHECKING=YESTCP.INVITED_NODES=(127.0.0.1,10.88.99.2,10.88.99.168,10.88.99.24,10.88.99.13)  --可以访问的IP

8.ORACLE10G修改内存

ALTER SYSTEM SET SGA_MAX_SIZE=960M SCOPE=SPFILE;ALTER SYSTEM SET SGA_TARGET=960M SCOPE=SPFILE;ALTER SYSTEM SET PGA_AGGREGATE_TARGET=240M SCOPE=SPFILE;

9.编写SCHEDULER

-- 执行业务操作BEGINDBMS_SCHEDULER.CREATE_JOB(JOB_NAME => 'DX_NETTAG_JOB',JOB_TYPE => 'PLSQL_BLOCK',JOB_ACTION => 'BEGIN UPDATE TD_TASKLIST SET NET_TAG = 3 WHERE SYSTEM_MARK = 1; COMMIT; END;',START_DATE => SYSDATE,REPEAT_INTERVAL => 'FREQ=MINUTELY;INTERVAL=10;BYHOUR=1,2,3,4,5,6',ENABLED => TRUE);END;/--启动JOBBEGINDBMS_SCHEDULER.ENABLE('DX_NETTAG_JOB');END;/-- 运行job  BEGIN     DBMS_SCHEDULER.RUN_JOB('DX_NETTAG_JOB',TRUE); -- TRUE代表同步执行  END;  /  --删除JOBBEGINDBMS_SCHEDULER.DROP_JOB(JOB_NAME => 'DX_NETTAG_JOB',FORCE => TRUE);  END;/-- 停止job  BEGIN     DBMS_SCHEDULER.STOP_JOB(JOB_NAME => 'DX_NETTAG_JOB',FORCE => TRUE);  END;   /  -- 查询job  SELECT * FROM USER_SCHEDULER_JOBS;  SELECT * FROM DBA_SCHEDULER_JOBS;  --查看数据SELECT T.*, T.ROWID FROM AAA T--更改DATE的格式ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD';  ALTER SESSION SET NLS_TIMESTAMP_FORMAT='YYYY-MM-DD HH24:MI:SS';  ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT='YYYY-MM-DD HH:MI:SS.FF AM TZR'; --查看DATE的格式SELECT * FROM NLS_SESSION_PARAMETERS WHERE PARAMETER LIKE '%_DATE_%' OR PARAMETER LIKE '%_TIMESTAMP_%';  --授权 sys GRANT CREATE JOB TO DXCDC; GRANT MANAGE SCHEDULER TO DXCDC;--测试JOB执行的时间SET SERVEROUTPUT ON SIZE 999999DECLARE  L_START_DATE  TIMESTAMP;  L_NEXT_DATE   TIMESTAMP;  L_RETURN_DATE TIMESTAMP;BEGIN  L_START_DATE  := TRUNC(SYSTIMESTAMP);  L_RETURN_DATE := L_START_DATE;  FOR CTR IN 1 .. 50 LOOP    DBMS_SCHEDULER.EVALUATE_CALENDAR_STRING('FREQ=DAILY;BYHOUR=0,1,2,3,4,5,6,7,22,23',                                            L_START_DATE,                                            L_RETURN_DATE,                                            L_NEXT_DATE);      DBMS_OUTPUT.PUT_LINE('NEXT RUN ON: ' ||                         TO_CHAR(L_NEXT_DATE, 'YYYY-MM-DD HH24:MI:SS'));      L_RETURN_DATE := L_NEXT_DATE;    END LOOP;END;/

10. 查询ORACLE限制

select count(*) from v$session;   42select * from v$license;SESSIONS_MAX:指定允许同时进行的并行用户会话的最大数量。达到该限制后, 只有具有 RESTRICTED SESSION 权限的用户才能连接到服务器。所有其他用户都会收到一条警告消息, 表明已达到系统最大容量的限制SESSIONS_WARNING:指定对并行用户会话数量的警告限制。达到该限制后, 其他用户仍然可以连接, 但一条消息将被写入 ALERT 文件。具有RESTRICTED SESSION 权限的用户将收到一条警告消息, 表明系统已接近最大容量。USERS_MAX:指定您可在该数据库中创建的用户的最大数量。并行会话使用许可和用户使用许可不应被同时启用。LICENSE_MAX_SESSIONS 或 LICENSE_MAX_USERS 或这两者的值应为零。SESSIONS_CURRENT 表示已经连接的 SESSION 数量（注：该值并不等于 v$session 中查询出来的数量，似乎并不包括 Oracle 本身连接的 SESSION，

11.生成执行计划步骤

(1). sys进入--创建 plan tableSQL> @?rdbms/admin/utlxplanSQL> create public synonym plan_table for plan_table;SQL> grant all on plan_table to public ;--创建plustrace 角色SQL> @?sqlplus/admin/plustrce --执行plustrce.sql--plustrace授予publicSQL> grant plustrace to public;(2).普通用户进入set autotrace traceonly;sqlcontent;或者 explain plan for sqlcontent;select * from table(dbms_xplan.display)

12.强制使用索引

SELECT /*+index_ffs(B idx_TD_JXC_PURMTB_4)*/       NVL(SUBSTR(Z.ZONE_GB, 0, 4), '合计') AS ZONE_CODE,       NVL(SUM(DECODE(B.INXTYPEID, 1, 1, 17, 1, 0)), '0') AS RST1,       NVL(SUM(DECODE(B.INXTYPEID, 1, B.IF_INTIME, 17, B.IF_INTIME, 0)), '0') AS RST2  FROM XT_ZONE Z  LEFT JOIN XT_UNIT A ON A.ZONE_ID = Z.RID AND A.ORGIDX IS NULL  LEFT JOIN TD_JXC_PURMTB B ON B.ORGIDX = A.RID AND B.INXDAY BETWEEN TO_DATE('2013-01-01', 'YYYY-MM-DD')            AND TO_DATE('2013-12-31', 'YYYY-MM-DD') WHERE 1 = 1   AND Z.ZONE_GB LIKE '32%' GROUP BY ROLLUP(SUBSTR(Z.ZONE_GB, 0, 4))全表扫描SELECT /*+full(B) full(C)*/       NVL(SUBSTR(Z.ZONE_GB, 0, 4), '合计') AS ZONE_CODE,       NVL(SUM(DECODE(B.INXTYPEID, 1, 1, 17, 1, 0)), '0') AS RST1,       NVL(SUM(DECODE(B.INXTYPEID, 1, B.IF_INTIME, 17, B.IF_INTIME, 0)),'0') AS RST2  FROM XT_ZONE Z  LEFT JOIN XT_UNIT A ON A.ZONE_ID = Z.RID AND A.ORGIDX IS NULL  LEFT JOIN TD_JXC_PURSUB C ON C.ORGIDX = A.RID  LEFT JOIN TD_JXC_PURMTB B ON C.MTBIDX = B.RID AND B.INXDAY BETWEEN TO_DATE('2013-01-01', 'YYYY-MM-DD') AND TO_DATE('2013-12-31', 'YYYY-MM-DD') WHERE 1 = 1 AND Z.ZONE_GB LIKE '32%' GROUP BY ROLLUP(SUBSTR(Z.ZONE_GB, 0, 4));

13.查看表占用的空间

select table_name,(blocks+empty_blocks)*8*1024 from   user_tables  where table_name in ('TD_JXC_PURMTB', 'TD_JXC_PURSUB')

14.索引管理

(1).移动索引的表空间ALTER INDEX INDEX_OWNER.INDEX_NAME REBUILD TABLESPACE NEW_TBS;(2).获得某个SCHEMA下移动索引表空间的所有语句SELECT 'ALTER INDEX '||OWNER||'.'||INDEX_NAME||' REBUILD TABLESPACE NEW_TBS;'  FROM DBA_INDEXES   WHERE TABLE_OWNER='SCHEMA_NAME'  ORDER BY INDEX_NAME;  (3).创建新表，指定唯一索引的表空间CREATE TABLE TMP(   MON VARCHAR2(6) ,   IDNO VARCHAR2(10) ,   CONSTRAINT PK_NAME PRIMARY KEY ( MON, IDNO )   USING INDEX TABLESPACE INDEX_TBS,  CONSTRAINT UK_NAME UNIQUE (MON)  USING INDEX TABLESPACE INDEX_TBS  

15.清空缓存

--sys用户--清空共享池:ALTER SYSTEM FLUSH SHARED_POOL;--清空BUFER ALTER SYSTEM FLUSH BUFFER_CACHE;ALTER SESSION SET RESULT_CACHE_MODE = MANUAL;

16查询ORACLE的CPU个数

Select * FROM V$OPTION where parameter like 'Parallel%';select * from V$pq_sesstat;