Snowflake follows the Unicode Collation Algorithm (UCA). When comparing values in a collated column, That are allowed varies, depending on the number of bytes each character takes and the collation specification of the column. Know the maximum size for a column, you could limit the size when you add the column.Ĭollation: When you specify a collation for a VARCHAR column, the number of characters Tools for working with data: Some BI/ETL tools define the maximum size of the VARCHAR data in storage or in memory. Not as fast as SELECT statements filtered using a date or numeric column condition. Note that in any relational database, SELECT statements in which a WHERE clause references VARCHAR columns or string columns are Performance: There is no performance difference between using the full-length VARCHAR declaration VARCHAR(16777216) and a VARCHAR(16777216) column only consumes a single character. Storage: A column consumes storage for only the amount of actual data stored. When choosing the maximum length for a VARCHAR column, consider the following: The maximum number of Unicode characters that can be stored in a VARCHAR column is shown below: Single-byteīetween 8,388,608 (2 bytes per character) and 4,194,304 (4 bytes per character).įor example, if you declare a column as VARCHAR(16777216), the column can hold a maximum of 8,388,608 2-byte Unicode characters,Įven though you specified a maximum length of 16777216. If no length is specified, the default is the maximum allowed length (16,777,216).Īlthough a VARCHAR’s maximum length is specified in characters, a VARCHAR is also limited to a maximum number ofīytes (16,777,216 (16 MB)).
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