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In Postgresql how do you convert a text field to a varchar? I have tried both of the below, but neither convert my text field to varchar.
Cast(Iamtextfield As Varchar)
Char(Iamtextfield)
827
There is no a big problem to change varchar to text because text supports more data length than varchar , but if the field has a index it must be drop and create new index with prefix col_name(length) (see CREATE INDEX syntax).
TO_NUMBER converts a string to a number of data type NUMERIC. TO_CHAR performs the reverse operation; it converts a number to a string. CAST and CONVERT can be used to convert a string to a number of any data type. For example, you can convert a string to a number of data type INTEGER.
VARCHAR is a variable length string data type, so it holds only the characters you assign to it. VARCHAR takes up 1 byte per character, + 2 bytes to hold length information.
In SQL Server, converting a string to date explicitly can be achieved using CONVERT(). CAST() and PARSE() functions.
text is just another term for unlimited varchar in PostgreSQL.
But if you want to make sure the type is set correctly in the return output, simply:
iamtextfield::varchar
Or if it is case sensitive
"Iamtextfield"::varchar
If you want to truncate you can do something like:
iamtextfield::varchar(5)
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