What Nature reserve number was established on 19961220 20.12.1996
CREATE TABLE table_26013618_1 (nsg_nr INTEGER, date_established VARCHAR)
SELECT MIN(nsg_nr) FROM table_26013618_1 WHERE date_established = "19961220 20.12.1996"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26013618_1 (nsg_nr INTEGER, date_established VARCHAR) Question: What Nature reserve number was established on 19961220 20.12.1996 [/INST] SELECT MIN(nsg_nr) FROM table_26013618_1 WHERE date_established = "19961220 20.12.1996" </s>