The LEFT function returns the left-most character or characters in a string. The function takes two parameters, the first being the source string and the second being the number of characters to return.
LEFT(string,integer) : string
The example query returns a column labelled “test” that contains only the left most base in the reference column in the #dbsnp# reference data file.
gor #dbsnp# | TOP 10 | CALC test left(reference,1)
The next query returns the first ten rows in #dbsnp# where the left-most base in the reference column is “A”.
gor #dbsnp# | WHERE left(reference,1) = 'A' | TOP 10