diff --git a/db/update3.0.sql b/db/update3.0.sql
deleted file mode 100755
index 3314802ab4..0000000000
--- a/db/update3.0.sql
+++ /dev/null
@@ -1,3 +0,0 @@
--- add estimateStartDate and actualStartDate field.
-ALTER TABLE  `zt_task` ADD  `estimateStartDate` DATETIME NOT NULL AFTER  `assignedDate` ,
-ADD  `actualStartDate` DATETIME NOT NULL AFTER  `estimateStartDate`;