彬红茶小童鞋 45 个非常有用的 Oracle 查询语句

1

SELECT

TRUNC (SYSDATE, 

'MONTH'

) 

"First day of current month"

2

FROM

DUAL;

1

SELECT

TRUNC (LAST_DAY (SYSDATE)) 

"Last day of current month"

2

FROM

DUAL;

1

SELECT

TRUNC (SYSDATE, 

'YEAR'

) 

"Year First Day"

FROM

DUAL;

1

SELECT

ADD_MONTHS (TRUNC (SYSDATE, 

'YEAR'

), 12) - 1 

"Year Last Day"

FROM

DUAL

1

SELECT

CAST

(TO_CHAR (LAST_DAY (SYSDATE), 

'dd'

) 

AS

INT

) number_of_days

2

FROM

DUAL;

1

SELECT

SYSDATE,

2

LAST_DAY (SYSDATE) 

"Last"

,

3

LAST_DAY (SYSDATE) - SYSDATE 

"Days left"

4

FROM

DUAL;

1

SELECT

ROUND ( (MONTHS_BETWEEN (

'01-Feb-2014'

, 

'01-Mar-2012'

) * 30), 0)

2

num_of_days

3

FROM

DUAL;

4

5

OR

6

7

SELECT

TRUNC(sysdate) - TRUNC(e.hire_date) 

FROM

employees;

01

SELECT

ADD_MONTHS (TRUNC (SYSDATE, 

'MONTH'

), i) start_date,

02

TRUNC (LAST_DAY (ADD_MONTHS (SYSDATE, i))) end_date

03

FROM

XMLTABLE (

04

'for $i in 0 to xs:int(D) return $i'

05

PASSING XMLELEMENT (

06

d,

07

FLOOR (

08

MONTHS_BETWEEN (

09

ADD_MONTHS (TRUNC (SYSDATE, 

'YEAR'

) - 1, 12),

10

SYSDATE)))

11

COLUMNS i 

INTEGER

PATH 

'.'

);

1

SELECT

(SYSDATE - TRUNC (SYSDATE)) * 24 * 60 * 60 num_of_sec_since_morning

2

FROM

DUAL;

1

SELECT

(TRUNC (SYSDATE+1) - SYSDATE) * 24 * 60 * 60 num_of_sec_left

2

FROM

DUAL;

1

SELECT

table_name

2

FROM

user_tables

3

WHERE

table_name = 

'TABLE_NAME'

;

1

SELECT

column_name 

AS

FOUND

2

FROM

user_tab_cols

3

WHERE

table_name = 

'TABLE_NAME'

AND

column_name = 

'COLUMN_NAME'

;

1

SELECT

DBMS_METADATA.get_ddl (

'TABLE'

, 

'TABLE_NAME'

, 

'USER_NAME'

) 

FROM

DUAL;

1

SELECT

SYS_CONTEXT (

'userenv'

, 

'current_schema'

) 

FROM

DUAL;

1

ALTER

SESSION 

SET

CURRENT_SCHEMA = new_schema;

1

SELECT

* 

FROM

v$version;

1

SELECT

username,

2

profile,

3

default_tablespace,

4

temporary_tablespace

5

FROM

dba_users;

1

SELECT

* 

FROM

nls_database_parameters;

1

SELECT

VALUE

2

FROM

v$system_parameter

3

WHERE

name

= 

'compatible'

;

1

CREATE

TABLE

tab (col1 VARCHAR2 (10));

2

3

CREATE

INDEX

idx1

4

ON

tab (

UPPER

(col1));

5

6

ANALYZE 

TABLE

a COMPUTE 

STATISTICS

;

1

ALTER

DATABASE

DATAFILE 

'/work/oradata/STARTST/STAR02D.dbf'

resize 2000M;

1

SELECT

SUBSTR (file_name, 1, 50), AUTOEXTENSIBLE 

FROM

dba_data_files;

2

3

(

OR

)

4

5

SELECT

tablespace_name, AUTOEXTENSIBLE 

FROM

dba_data_files;

1

ALTER

TABLESPACE data01 

ADD

DATAFILE 

'/work/oradata/STARTST/data01.dbf'

2

SIZE

1000M AUTOEXTEND 

OFF

;

1

ALTER

DATABASE

DATAFILE 

'/u01/app/Test_data_01.dbf'

RESIZE 2G;

1

SELECT

SUM

(bytes) / 1024 / 1024 / 1024 

AS

GB 

FROM

dba_data_files;

1

SELECT

SUM

(bytes) / 1024 / 1024 / 1024 

AS

GB 

FROM

dba_segments;

1

SELECT

SUM

(bytes / 1024 / 1024) 

"size"

2

FROM

dba_segments

3

WHERE

owner = 

'&owner'

;

01

SELECT

S.USERNAME || 

'('

|| s.sid || 

')-'

|| s.osuser UNAME,

02

s.program || 

'-'

|| s.terminal || 

'('

|| s.machine || 

')'

PROG,

03

s.sid || 

'/'

|| s.serial# sid,

04

s.status 

"Status"

,

05

p.spid,

06

sql_text sqltext

07

FROM

v$sqltext_with_newlines t, V$SESSION s, v$process p

08

WHERE

t.address = s.sql_address

09

AND

p.addr = s.paddr(+)

10

AND

t.hash_value = s.sql_hash_value

11

ORDER

BY

s.sid, t.piece;

1

SELECT

ss.username, se.SID, VALUE / 100 cpu_usage_seconds

2

FROM

v$session ss, v$sesstat se, v$statname sn

3

WHERE

se.STATISTIC# = sn.STATISTIC#

4

AND

NAME

LIKE

'%CPU used by this session%'

5

AND

se.SID = ss.SID

6

AND

ss.status = 

'ACTIVE'

7

AND

ss.username 

IS

NOT

NULL

8

ORDER

BY

VALUE 

DESC

;

01

SELECT

a.sid,

02

a.serial#,

03

b.username,

04

opname OPERATION,

05

target OBJECT,

06

TRUNC (elapsed_seconds, 5) 

"ET (s)"

,

07

TO_CHAR (start_time, 

'HH24:MI:SS'

) start_time,

08

ROUND ( (sofar / totalwork) * 100, 2) 

"COMPLETE (%)"

09

FROM

v$session_longops a, v$session b

10

WHERE

a.sid = b.sid

11

AND

b.username 

NOT

IN

(

'SYS'

, 

'SYSTEM'

)

12

AND

totalwork > 0

13

ORDER

BY

elapsed_seconds;

1

SELECT

b.sid,

2

b.serial#,

3

a.spid processid,

4

b.process clientpid

5

FROM

v$process a, v$session b

6

WHERE

a.addr = b.paddr 

AND

b.audsid = USERENV (

'sessionid'

);

1

SELECT

CREATED, 

TIMESTAMP

, last_ddl_time

2

FROM

all_objects

3

WHERE

OWNER = 

'MYSCHEMA'

4

AND

OBJECT_TYPE = 

'TABLE'

5

AND

OBJECT_NAME = 

'EMPLOYEE_TABLE'

;

01

SELECT

*

02

FROM

(  

SELECT

ROWNUM,

03

SUBSTR (a.sql_text, 1, 200) sql_text,

04

TRUNC (

05

a.disk_reads / DECODE (a.executions, 0, 1, a.executions))

06

reads_per_execution,

07

a.buffer_gets,

08

a.disk_reads,

09

a.executions,

10

a.sorts,

11

a.address

12

FROM

v$sqlarea a

13

ORDER

BY

3 

DESC

)

14

WHERE

ROWNUM < 10;

1

SELECT

osuser,

2

username,

3

machine,

4

program

5

FROM

v$session

6

ORDER

BY

osuser;

1

SELECT

program application, 

COUNT

(program) Numero_Sesiones

2

FROM

v$session

3

GROUP

BY

program

4

ORDER

BY

Numero_Sesiones 

DESC

;

1

SELECT

username Usuario_Oracle, 

COUNT

(username) Numero_Sesiones

2

FROM

v$session

3

GROUP

BY

username

4

ORDER

BY

Numero_Sesiones 

DESC

;

1

SELECT

owner, 

COUNT

(owner) number_of_objects

2

FROM

dba_objects

3

GROUP

BY

owner

4

ORDER

BY

number_of_objects 

DESC

;

1

SELECT

TO_CHAR (TO_DATE (1526, 

'j'

), 

'jsp'

) 

FROM

DUAL;

1

one thousand five hundred twenty-six

1

--search a string foo_something in package source code

2

SELECT

*

3

FROM

dba_source

4

WHERE

UPPER

(text) 

LIKE

'%FOO_SOMETHING%'

5

AND

owner = 

'USER_NAME'

;

1

WITH

csv

2

AS

(

SELECT

'AA,BB,CC,DD,EE,FF'

3

AS

csvdata

4

FROM

DUAL)

5

SELECT

REGEXP_SUBSTR (csv.csvdata, 

'[^,]+'

, 1, 

LEVEL

) pivot_char

6

FROM

DUAL, csv

7

CONNECT

BY

REGEXP_SUBSTR (csv.csvdata,

'[^,]+'

, 1, 

LEVEL

) 

IS

NOT

NULL

;

01

SELECT

*

02

FROM

employees

03

WHERE

ROWID 

IN

(

SELECT

MAX

(ROWID) 

FROM

employees);

04

05

(

OR

)

06

07

SELECT

* 

FROM

employees

08

MINUS

09

SELECT

*

10

FROM

employees

11

WHERE

ROWNUM < (

SELECT

COUNT

(*) 

FROM

employees);

01

WITH

tbl

02

AS

(

SELECT

-2 num 

FROM

DUAL

03

UNION

04

SELECT

-3 num 

FROM

DUAL

05

UNION

06

SELECT

-4 num 

FROM

DUAL),

07

sign_val

08

AS

(

SELECT

CASE

MOD (

COUNT

(*), 2) 

WHEN

0 

THEN

1 

ELSE

-1 

END

val

09

FROM

tbl

10

WHERE

num < 0)

11

SELECT

EXP (

SUM

(LN (

ABS

(num)))) * val

12

FROM

tbl, sign_val

13

GROUP

BY

val;

01

SELECT

LEVEL

empl_id,

02

MOD (ROWNUM, 50000) dept_id,

03

TRUNC (DBMS_RANDOM.VALUE (1000, 500000), 2) salary,

04

DECODE (ROUND (DBMS_RANDOM.VALUE (1, 2)),  1, 

'M'

,  2, 

'F'

) gender,

05

TO_DATE (

06

ROUND (DBMS_RANDOM.VALUE (1, 28))

07

|| 

'-'

08

|| ROUND (DBMS_RANDOM.VALUE (1, 12))

09

|| 

'-'

10

|| ROUND (DBMS_RANDOM.VALUE (1900, 2010)),

11

'DD-MM-YYYY'

)

12

dob,

13

DBMS_RANDOM.STRING (

'x'

, DBMS_RANDOM.VALUE (20, 50)) address

14

FROM

DUAL

15

CONNECT

BY

LEVEL

< 10000;

1

--generate random number between 0 and 100

2

SELECT

ROUND (DBMS_RANDOM.VALUE () * 100) + 1 

AS

random_num 

FROM

DUAL;

1

SELECT

1

2

FROM

TABLE_NAME

3

WHERE

ROWNUM = 1;