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Snippet Name: Date Functions: TRUNC

Description: Convert a date to the date it would be at midnight.

Using the option with TRUNC formats the date according to the given format spec.

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» FUNCTIONS: Deterministic
» FUNCTIONS: Nested Functions
» FUNCTIONS: IF statement
» FUNCTIONS: date/time
» FUNCTIONS: Sample functions
» FUNCTIONS: drop
» FUNCTIONS: Recompile
» FUNCTIONS: DEBUG mode
» FUNCTIONS: IN OUT parameter
» FUNCTIONS: with output parameters
» FUNCTIONS: with parameters
» FUNCTIONS: without parameters
» FUNCTIONS: Create function
» FUNCTIONS: special restrictions
» FUNCTIONS: System Privileges
» Recursive fopen() function
» INDEXES: ENABLE (function-based index)
» INDEXES: DISABLE (function-based index)
» PACKAGES: one function
» INDEXES: Function-Based Index
» IN Function
» Built-In Functions: CASE
» Built-In Functions: DECODE
» Alternate Title Case function
» SELECT: Using Functions
» UPDATE: Update a partitioned table
» UPDATE: Update based on a record

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 03rd, 2009

TRUNC(<date_time>)
 
CREATE TABLE t (
datecol DATE);
 
INSERT INTO t (datecol) VALUES (SYSDATE);
 
INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE));
 
INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE, 'HH'));
 
INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE, 'MI'));
 
COMMIT;
 
SELECT TO_CHAR(datecol, 'DD-MON-YYYY HH:MI:SS')
FROM t;
 
--------------------------------------------
 
TRUNC(<date_time>, '<format>')
 
SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY HH:MI:SS')
FROM dual;
 
-- first day of the month
SELECT TO_CHAR(TRUNC(SYSDATE, 'MM'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;
 
SELECT TO_CHAR(TRUNC(SYSDATE, 'MON'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;
 
SELECT TO_CHAR(TRUNC(SYSDATE, 'MONTH'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;
 
-- first day of the year
SELECT TO_CHAR(TRUNC(SYSDATE, 'YYYY'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;
 
SELECT TO_CHAR(TRUNC(SYSDATE, 'YEAR'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;


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