SELECT DISTINCT first_name FROM contacts ORDER BY first_name;Code language: SQL (Structured Query Language) (sql) Now, the result set has 302 rows, meaning that 17 duplicate rows have been removed. B) Oracle SELECT DISTINCT multiple columns example See the following order_items table: The fol...
你可以使用COUNT(DISTINCT col1 || '-' || col2)，但如果列是字符串值，并且你有'ab-'||'-'|...
A subquery isused only in conjunction with the XML keyword. When you specify asubquery, all values found by the subquery are used for pivoting. The output isnot the same cross-tabular format returned by non-XML pivot queries. Instead ofmultiple columns specified in the pivot_in_clause, the ...
Trying to concatenate multiple columns in OBI Recruiting Legacy Content Hello, I'm trying to concatenate multiple columns with spaces and commas in OBI Recruiting Legacy. Below is my current formula that I'm trying to use as an example and the output I wish to have. ...
Trying to concatenate multiple columns in OBI Recruiting Legacy Content Hello, I'm trying to concatenate multiple columns with spaces and commas in OBI Recruiting Legacy. Below is my current formula that I'm trying to use as an example and the output I wish to have. ...
shutdown 时 SMON 会扫描 col_usage$并找出已被 drop 表的相关 predicate columns 记录,并删除这部 分”orphaned”孤儿记录。 我们来具体了解 col_usage$的填充过程: SQL> select * from v$version; BANNER --- Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi PL/SQL Release 10.2.0.4....
• How many distinct users used the system in a week? • What are the average queries ran by the user in a week? • How many logical queries ran by the top users? Duty Roles The Usage Tracking Analysis Duty role secures access to this subject area. See Common Duty Roles. Primary...
I’m guessing that Oracle aggregates (distinct) the GTT table down with the equivalent of an inline view: “select distinct fid, eid, etyp, dcd from …“ (the 10053 (CBO) trace might show this as one of the “unparsed” queries). If that’s the case, why not have a summary GTT...
WHERE clause constraints are evaluated on the data before it is grouped. HAVING clause constraints are evaluated on the results of the data after it has been grouped together. You can specify multiple columns in a GROUP BY clause. For example, the following query includes the city and descripti...
COMPUTE|ESTIMATE STATISTICSFOR COLUMNS [SIZE int] column [SIZE int] When Estimating statistics youcan optionally specify ... ESTIMATE STATISTICSSAMPLE n ROWS ... ESTIMATE STATISTICSSAMPLE n PERCENT 四. Semantics 4.1 schema Specify theschema containing the table, index, or cluster. If you omit sche...