Technically it should be:
LEFT(myString, CHARINDEX(' ', myString + ' ') - 1)
unless you want a trailing space in the result :-).
Adding the "+ ' '" will cause the code to return the complete string if a space is not found.
SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.