You cannot add a column with a default value in Hive. You have the right syntax for adding the column ALTER TABLE test1 ADD COLUMNS (access_count1 int);, you just need to get rid of default sum(max_count). No changes to that files backing your table will happen as a result of adding the column. Hive handles … Read more
Yes, here you can use LIMIT. You can try it by the below query: SELECT * FROM employee_list SORT BY salary DESC LIMIT 2
You can use the percentile function to compute the median. Try this: select percentile(cast(age as BIGINT), 0.5) from table_name
Found the solution: ALTER TABLE tableA CHANGE ts ts BIGINT AFTER id; See this for complete details: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterColumn
You cannot drop column directly from a table using command ALTER TABLE table_name drop col_name; The only way to drop column is using replace command. Lets say, I have a table emp with id, name and dept column. I want to drop id column of table emp. So provide all those columns which you want … Read more
datediff(to_date(String timestamp), to_date(String timestamp)) For example: SELECT datediff(to_date(‘2019-08-03’), to_date(‘2019-08-01’)) <= 2;
tblproperties will give the size of the table and can be used to grab just that value if needed. — gives all properties show tblproperties yourTableName — show just the raw data size show tblproperties yourTableName(“rawDataSize”)
regexp_replace UDF performs my task. Below is the definition and usage from apache Wiki. regexp_replace(string INITIAL_STRING, string PATTERN, string REPLACEMENT): This returns the string resulting from replacing all substrings in INITIAL_STRING that match the java regular expression syntax defined in PATTERN with instances of REPLACEMENT, e.g.: regexp_replace(“foobar”, “oo|ar”, “”) returns fb
Hive supports bigint literal since 0.8 version. So, additional “L” is enough: COALESCE(column, 0L)