oracle sql functions

It was freezing, and I stayed at home and read "Mastering Oracle SQL" 2nd. I found that Oracle is still very powerful, and there are two hundred optical functions. It is difficult to simulate the Object-Oriented Query languages, in particular, Windows functions for OLAP in s

Oracle data types, functions and stored procedures, and oracle Data TypesString typeFixed Length: char nchar n indicates Unicode encodingVariable Length: varchar2 nvarchar2Number Type: number (P, S) P: integer digits, S decimal placesIntegerBINARY_FLOAT Single Floating PointBINARY_DOUBLE Double Floating PointFLOAT (N) floating point number N indicates precisionDA

1. type conversion functions: decimal, double, Integer, smallint, real, Hex (arg), date, time, timestamp, char, and varchar 1. type conversion functions: decimal, double, Integer, smallint, real, Hex (arg), date, time, timestamp, char, and varchar 1. type conversion functions: decimal, double, Integer, smallint, real, Hex (arg ), Date, time, timestamp, char,

ncharactersreturned is used to specify the number of characters returned, by default returning all characters before the value of the character expression ends.3. Example: STORE ' abcdefghijlkm ' to mystringSUBSTR (mystring, 1,5) displays "ABCDE" 1 characters that are truncated from the first character, including the first characterSUBSTR (mystring, 6) show "FGHIJKLM"SUBSTR (mystring,-2) shows "km" the rightmost character is-1, the rightmost left character is-2, then the default is left to take

T-SQL is an enhanced SQL language provided by SQLServer based on the SQL language. The T-SQL provides all the features of ANSISQL and adds more features such as extended functions, system pre-storage, and program design structures. The following describes 3. the T-

DUAL; A ------------------ 2014/6/3016: 40: 087 LOCALTIMESTAMP Format:LOCALTIMESTAMP ([p]) Note:Returns the date and time of the current session time zone. P is an integer between 0 and 9. The default value is 6. Different from CURRENT_TIMESTAMP in the returned data type Example: SQL> SELECT LOCALTIMESTAMP (4) A FROM DUAL; A -------------------------------------------------------------------------------- -14 04.42.09.2800 pm8 MONTHS_BETWEEN Format:MO

Introduction to Grouping functions A grouping function acts on a set of data and returns a value for a set of data. The common grouping functions are: Function name Function description Count Returns the number of records found Min Returns the minimum value of a numeric column or computed column Max Returns the maximum value of a numeric col

use of functions and cursors in Oracle --Creates a function and invokes the CREATE function fun1 (v_in_ename varchar2) return number is v_annual_sal number; Begin Select (SAL+NVL (comm,0)) *13 into V_annual_sal from EMP where ename=v_in_ename; return v_annual_sal; End /-Direct Call function var v_annual_sal number; Call Fun1 (' FORD ') into:v_annual_sal; Print v_annual_sal; --Package--demand: Write a pa

The following articles mainly introduce the comparison between common DB2 functions and Oracle functions. If you are curious about common DB2 functions and Oracle functions, this article will unveil the secrets of this article, th

SQL Function user-defined functions and function Functions Directory Background (why do I need to use a custom function if a stored procedure already exists)Development HistoryCompositionUsageApplicabilityNotesQuestionContent Background (why do I need to use a custom function if a stored procedure already exists) Differences from stored procedures (meaning ): 1.

References: Expert one-on-one and Oracle 9i reference Oracle functions are classified into two types: single-row functions and multi-row functions. Multiline functions are also Aggregate func