SQL Server replace, remove all after certain character

Question

My data looks like

ID    MyText
1     some text; some more text
2     text again; even more text

How can I update MyText to drop everything

Answer 1

Could use CASE WHEN to leave those with no ';' alone.

    SELECT
    CASE WHEN CHARINDEX(';', MyText) > 0 THEN
    LEFT(MyText, CHARINDEX(';', MyText)-1) ELSE
    MyText END
    FROM MyTable