Hàm CURRENT_TIMESTAMP – Oracle/PLSQL
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL là một trong các hàm trong danh sách được cung cấp sẵn cho người sử dụng khi thao tác với hệ quản trị cơ sở dữ liệu Oracle.
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL – Chức năng
The Oracle/PLSQL CURRENT_TIMESTAMP function returns the current date and time in the time zone of the current SQL session as set by the ALTER SESSION command. It returns a TIMESTAMP WITH TIME ZONE value.
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL – Cú pháp
Cú pháp Hàm CURRENT_TIMESTAMP trong Oracle/PLSQL như sau :
CURRENT_TIMESTAMP
Trong quá trình sử dụng hàm CURRENT_TIMESTAMP trong Oracle/PLSQL hãy nhớ :
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL – Chú ý
- A similar function to the CURRENT_TIMESTAMP function is the LOCALTIMESTAMP function.
- The difference between these two functions is that the CURRENT_TIMESTAMP function returns a TIMESTAMP WITH TIME ZONE value while the LOCALTIMESTAMP function returns a TIMESTAMP value.
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL – Phạm vi
Hàm CURRENT_TIMESTAMP có thể sẵn sàng sử dụng trong Oracle/PLSQL với các phiên bản Oracle như sau:
Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i
Hàm CURRENT_TIMESTAMP – Oracle/PLSQL – Ví dụ
Dưới đây là các ví dụ minh họa cách sử dụng hàm CURRENT_TIMESTAMP trong Oracle/PLSQL như sau:
The CURRENT_TIMESTAMP function can be used in Oracle/PLSQL.
If the following ALTER SESSION command was issued:
ALTER SESSION SET TIME_ZONE = '-7:0';
And then the following SQL statement was executed:
select CURRENT_TIMESTAMP from dual;
You might get the following result:
10-Sep-05 10.58.24.853421 PM -07:00
You then modified the session time zone with the following ALTER SESSION command:
ALTER SESSION SET TIME_ZONE = '-2:0';
And then the following SQL statement was executed:
select CURRENT_TIMESTAMP from dual;
You would now get the following result:
10-Sep-05 03.58.24.853421 AM -02:00
The session time zone value has changed from -7:0 to -2:0, causing the CURRENT_TIMESTAMP function to return the current date and time as a value 5 hours ahead.
Tham khảo các hàm built-in trong Oracle/PLSQL khác
STT | Tên hàm | Phạm vi | Chi tiết |
---|---|---|---|
1 | ABS | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
2 | ACOS | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
3 | ADD_MONTHS | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
4 | ASCII | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
5 | ASCIISTR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
6 | ASIN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
7 | ATAN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
8 | ATAN2 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
9 | AVG | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
10 | BFILENAME | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
11 | BIN_TO_NUM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
12 | BITAND | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
13 | CARDINALITY | Oracle 12c, Oracle 11g, Oracle 10g | xem |
14 | CASE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
15 | CEIL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
16 | CHR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
17 | COALESCE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
18 | CONCAT | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
19 | Concat with || | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
20 | CORR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
21 | COS | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
22 | COSH | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
23 | COVAR_POP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
24 | COVAR_SAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
25 | CUME_DIST | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
26 | CURRENT_DATE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
27 | CURRENT_TIMESTAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
28 | DBTIMEZONE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
29 | DECODE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
30 | DECOMPOSE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
31 | DENSE_RANK | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
32 | DUMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
33 | EMPTY_BLOB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
34 | EMPTY_CLOB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
35 | EXP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
36 | EXTRACT | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
37 | FIRST_VALUE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
38 | FLOOR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
39 | FROM_TZ | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
40 | GREATEST | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
41 | GROUP_ID | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
42 | HEXTORAW | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
43 | INITCAP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
44 | INSTR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
45 | INSTR2 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
46 | INSTR4 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
47 | INSTRB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
48 | INSTRC | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
49 | LAG | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
50 | LAST_DAY | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
51 | LAST_VALUE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
52 | LEAD | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
53 | LEAST | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
54 | LENGTH | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
55 | LENGTH2 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
56 | LENGTH4 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
57 | LENGTHB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
58 | LENGTHC | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
59 | LISTAGG | Oracle 12c, Oracle 11g Release 2 | xem |
60 | LN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
61 | LOCALTIMESTAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
62 | LOG | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
63 | LOWER | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
64 | LPAD | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
65 | LTRIM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
66 | MAX | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
67 | MEDIAN | Oracle 12c, Oracle 11g, Oracle 10g | xem |
68 | MIN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
69 | MONTHS_BETWEEN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
70 | NANVL | Oracle 12c, Oracle 11g, Oracle 10g | xem |
71 | NEW_TIME | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
72 | NEXT_DAY | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
73 | NTH_VALUE | Oracle 12c, Oracle 11g Release 2 | xem |
74 | NULLIF | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
75 | NUMTODSINTERVAL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
76 | NUMTOYMINTERVAL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
77 | NVL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
78 | NVL2 | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
79 | POWER | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
80 | RANK | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
81 | REGEXP_COUNT | Oracle 12c, Oracle 11g | xem |
82 | REGEXP_INSTR | Oracle 12c, Oracle 11g, Oracle 10g | xem |
83 | REGEXP_REPLACE | Oracle 12c, Oracle 11g, Oracle 10g | xem |
84 | REGEXP_SUBSTR | Oracle 12c, Oracle 11g, Oracle 10g | xem |
85 | REPLACE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
86 | ROUND (numbers) | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
87 | ROWNUM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
88 | RPAD | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
89 | RTRIM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
90 | SESSIONTIMEZONE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
91 | SIGN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
92 | SIN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
93 | SINH | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
94 | SQRT | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
95 | STDDEV | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
96 | SUBSTR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
97 | SUM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
98 | SYSDATE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
99 | SYSTIMESTAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
100 | TAN | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
101 | TANH | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
102 | TO_CHAR | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
103 | TO_CLOB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
104 | TO_DATE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
105 | TO_DSINTERVAL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
106 | TO_LOB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
107 | TO_MULTI_BYTE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
108 | TO_NCLOB | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
109 | TO_NUMBER | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
110 | TO_SINGLE_BYTE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
111 | TO_TIMESTAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
112 | TO_TIMESTAMP_TZ | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
113 | TO_YMINTERVAL | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i | xem |
114 | TRANSLATE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
115 | TRIM | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
116 | TRUNC (dates) | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
117 | TRUNC (numbers) | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
118 | UID | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
119 | UPPER | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
120 | USER | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
121 | USERENV | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
122 | VAR_POP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
123 | VAR_SAMP | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
124 | VARIANCE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
125 | VSIZE | Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i | xem |
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