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I've a set of data in a postgresql DB, where one of these columns store string data in float format, but now I need remove the decimal component of the string. How can I do this using an sql update statement in my BD console? Is that possible?
for example:
"25.3" -> "25"
If it does not possible how can I do this? Thanks in advance.
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Discussion: Use the :: operator to convert strings containing numeric values to the DECIMAL data type. In our example, we converted the string ' 5800.79 ' to 5800.79 (a DECIMAL value). This operator is used to convert between different data types.
PostgreSQL supports a CAST operator that is used to convert a value of one type to another. Syntax: CAST ( expression AS target_type ); Let's analyze the above syntax: First, specify an expression that can be a constant, a table column, an expression that evaluates to a value.
float4. single precision floating-point number. smallint. int2. signed two-byte integer.
real or float8 is a 4-byte floating-point number. numeric or numeric(p,s) is a real number with p digits with s number after the decimal point. The numeric(p,s) is the exact number.
You would be better suited casting the columns that were text, to numeric, to integer, so that rounding is taken into consideration e.g.
SELECT '25.3'::numeric::integer AS num1, '25.5'::numeric::integer AS num2
which would return integers of 25 and 26 respectively.
If you were not concerned with the digits following the point, the floor(column_name::numeric)::integer function or a substring, as mentioned, should be fine.
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