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In DuckDB, strings can be stored in the VARCHAR
field.
Name | Aliases | Description |
---|---|---|
VARCHAR |
CHAR , BPCHAR , TEXT , STRING |
variable-length character string |
VARCHAR(n) |
variable-length character string with maximum length n |
It is possible to supply a maximum length along with the type by initializing a type as VARCHAR(n)
, where n
is a positive integer. Note that specifying this length is not required, and specifying this length will not improve performance or reduce storage space of the strings in the database. Specifying a maximum length is useful only for data integrity reasons, not for performance reasons. In fact, the following SQL statements are equivalent:
-- the following statements are equivalent
CREATE TABLE strings(
val VARCHAR(10) -- val has a maximum length of 10 characters
);
CREATE TABLE strings(
val VARCHAR CHECK(LENGTH(val) <= 10) -- val has a maximum length of 10 characters
);
The VARCHAR
field allows storage of unicode characters. Internally, the data is encoded as UTF-8.
Functions
See Character Functions and Pattern Matching.
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