From ab69336254c570928454386a6297dbf64282ff50 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=BB=84=E6=B5=B7?= <10402852@qq.com>
Date: Mon, 12 Apr 2021 10:03:02 +0800
Subject: [PATCH] 'commit'

---
 Document/PG增加列.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Document/PG增加列.txt b/Document/PG增加列.txt
index 473d0603..6bc5f357 100644
--- a/Document/PG增加列.txt
+++ b/Document/PG增加列.txt
@@ -10,4 +10,8 @@ where  relkind = 'r' and relname like 'j%_r' and relname not like 'pg_%' and rel
 
 -- 设置默认值
 select 'DO $$  BEGIN   BEGIN   ALTER TABLE '||relname||' ALTER COLUMN recordyear  SET DEFAULT 2020;       EXCEPTION            WHEN duplicate_column THEN RAISE NOTICE ''column recordyear already exists'';   END; END;$$;'  as tabname from pg_class c 
-where  relkind = 'r' and relname like 'j%_r' and relname not like 'pg_%' and relname not like 'sql_%'  order by relname;
\ No newline at end of file
+where  relkind = 'r' and relname like 'j%_r' and relname not like 'pg_%' and relname not like 'sql_%'  order by relname;
+
+
+-- 删除默认值
+ALTER TABLE table_name ALTER COLUMN column_name DROP DEFAULT;
\ No newline at end of file