Oracle PL/SQL/Date Timezone/SYSDATE
Содержание
- 1 Adding One Month a certain date
- 2 Adding Two Months to SYSDATE
- 3 Combining TO_CHAR to Format SYSDATE
- 4 Finding the First Monday After the Current Date and Time
- 5 Get current operating system date
- 6 Minus days from sysdate
- 7 Removing the Time from SYSDATE
- 8 select sysdate
- 9 Truncating to the Quarter
- 10 use sysdate to init a variable
- 11 Using the SYSDATE function: return the current date from the system
Adding One Month a certain date
<source lang="sql">
SQL> SQL> Select ADD_MONTHS(TO_DATE("31-MAR-99"),1) from DUAL; ADD_MONTHS(TO_DATE("
30-APR-0099 00:00:00 1 row selected. SQL> SQL> --
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Adding Two Months to SYSDATE
<source lang="sql">
SQL> SQL> SELECT ADD_MONTHS(SYSDATE,2) from DUAL; ADD_MONTHS(SYSDATE,2
16-AUG-2008 18:08:07 1 row selected.
SQL> SQL> SQL> --
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Combining TO_CHAR to Format SYSDATE
<source lang="sql">
SQL> SQL> SELECT TO_CHAR(SYSDATE,"MM/DD/YYYY HH:MM:SS AM")
2 "Today"s Date and Time" from DUAL;
Today"s Date and Time
06/16/2008 06:06:07 PM 1 row selected. SQL> SQL> --
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Finding the First Monday After the Current Date and Time
<source lang="sql">
SQL> -- SQL> SQL> SELECT TO_CHAR(NEXT_DAY(SYSDATE,"Monday"),"MM/DD/YYYY HH:MM:SS AM")
2 "Next_Day" 3 from DUAL;
Next_Day
06/23/2008 06:06:08 PM 1 row selected. SQL> SQL> --
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Get current operating system date
<source lang="sql">
SQL> SQL> SELECT SYSDATE FROM dual; SYSDATE
30-AUG-06 SQL> SQL>
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Minus days from sysdate
<source lang="sql">
SQL> SQL> CREATE TABLE purchase (
2 product_name VARCHAR2(25), 3 salesperson VARCHAR2(3), 4 purchase_date DATE, 5 quantity NUMBER(4,2));
Table created. SQL> SQL> INSERT INTO purchase VALUES ("Small Widget", 10, sysdate, "1); ERROR: ORA-01756: quoted string not properly terminated
SQL> INSERT INTO purchase VALUES ("Medium Widget", 15, sysdate-14, 2); 1 row created. SQL> INSERT INTO purchase VALUES ("Round Station", 25, sysdate-7, 3); 1 row created. SQL> INSERT INTO purchase VALUES ("Product Number", 10, sysdate+7, 4); 1 row created. SQL> SQL> SQL> SQL> DROP TABLE purchase; Table dropped. SQL> SQL>
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Removing the Time from SYSDATE
<source lang="sql">
SQL> SQL> SELECT TO_CHAR(TRUNC(SYSDATE),"MM/DD/YYYY HH:MM:SS AM")
2 "Today"s Date and Time" 3 from DUAL;
Today"s Date and Time
06/16/2008 12:06:00 AM 1 row selected. SQL> --
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select sysdate
<source lang="sql">
SQL> SQL> select sysdate
2 from dual 3 /
SYSDATE
16-JUN-08 1 row selected. SQL> --
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Truncating to the Quarter
<source lang="sql">
SQL> -- SQL> SQL> SELECT TO_CHAR(TRUNC(SYSDATE,"Q"),"MM/DD/YYYY HH:MM:SS AM")
2 "Today"s Date and Time" 3 from DUAL 4
SQL> --
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use sysdate to init a variable
<source lang="sql">
SQL> SQL> set echo on SQL> SQL> DECLARE
2 v_MyChar VARCHAR2(20) := "test";
3 v_NUMBER NUMBER;
4 V_Date DATE := SYSDATE;
5 v_counter INTEGER;
6 BEGIN
7 DBMS_OUTPUT.PUT_LINE("This is a Test");
8 DBMS_OUTPUT.PUT_LINE("Of Syntax Error Debugging");
9 For v_COUNTER IN 1..5 LOOP
10 DBMS_OUTPUT.PUT_LINE("You are in loop:" || v_counter);
11 END LOOP;
12 END;
13 /
This is a Test Of Syntax Error Debugging You are in loop:1 You are in loop:2 You are in loop:3 You are in loop:4 You are in loop:5 PL/SQL procedure successfully completed. SQL> SQL> SQL> SQL> --
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Using the SYSDATE function: return the current date from the system
<source lang="sql">
SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> --Using the SYSDATE function: return the current date from the system. SQL> SQL> SELECT ID, Start_Date FROM Employee WHERE Start_Date < SYSDATE; ID START_DAT
---------
01 25-JUL-96 02 21-MAR-76 03 12-DEC-78 04 24-OCT-82 05 15-JAN-84 06 30-JUL-87 07 31-DEC-90 08 17-SEP-96 8 rows selected. SQL> SQL> SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL>
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