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1 cze 2023 · The Oracle TO_NUMBER function is used to convert a text value to a number value. It works similar to the TO_DATE and TO_CHAR functions but converts the values to a number. The function takes many different data types: BINARY_FLOAT. BINARY_DOUBLE. CHAR. VARCHAR2. NCHAR. NVARCHAR2.
TO_NUMBER converts expr to a value of NUMBER data type. expr can be any expression that evaluates to a character string of type CHAR, VARCHAR2, NCHAR, or NVARCHAR2, a numeric value of type NUMBER, BINARY_FLOAT, or BINARY_DOUBLE, or null. If expr is NUMBER, then the function returns expr.
to_number converts a text type (or a binary_double) to a number. It is best to try and separate in your mind the concept of a number and the various ways you can present that number visually (eg leading zeros, comma thousand seperators etc) - the visual representation is not a number, it is text.
27 lut 2009 · It seems that if you specify NUMBER alone, you get NUMBER(38, 127) where both 38 (precision) and 127 (scale) are the maximum possible. However, if you specify NUMBER(p) then you get NUMBER(p, 0) where the scale is zero.
Currently I have a column that is declared as a NUMBER. I want to change the precision of the column to NUMBER (14,2). SO, I ran the command. alter table EVAPP_FEES modify AMOUNT NUMBER(14,2)'. for which, I got an error : column to be modified must be empty to decrease precision or scale.
This Oracle tutorial explains how to use the Oracle / PLSQL TO_NUMBER function with syntax and examples. The Oracle / PLSQL TO_NUMBER function converts a string to a number.
You can't call the to_number function with the third parameter and not the second. I would suggest putting the "ugly" format string in a package constant and forget about it. You could also use dbms_session.set_nls to modify your NLS settings and be able to use to_number without arguments.
