in SELECT*FROMioc_dw_second.test0001 aWHEREridin(SELECTridFROMioc_dw_second.test0002 b ) not exists SELECT*FROMioc_dw_second.test0001 aWHEREnotexists(SELECT*FROMioc_dw_second.test0002 bWHEREa.rid=b.rid ) 2. delete 删除 in 和 using 的区别 deletefromioc_dw_second.test0001 a using ioc_...
select tbl1.col1, tbl2.col2 from tbl1 left outer join tbl2 using(col3) where tbl1.col1 in (5, 6); 那么,对应的伪代码如下: outer_iter = iterator over tbl1 where col1 in (5, 6)outer_row = outer_iter.nextwhile outer_row inner_iter = iterator over tbl2 where col3 = outer_r...
For each tuple r in R do -- 扫描外表R store used columns as p from R in Join Buffer -- 将部分或者全部R的记录保存到Join Buffer中,记为p For each tuple s in S do -- 扫描内表S If p and s satisfy the join condition -- p与s满足join条件 Then output the tuple -- 返回为结果集 ...
select dept.name,count(teacher.name)from teacher right join dept on dept.id=teacher.dept group by dept.name; Use CASE to show thenameof each teacher followed by ‘Sci’ if the teacher is indept1 or 2 and ‘Art’ otherwise. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select teache...
Select (highlight) the SQL statement that you want to run, then clickRunto run the statement and display the results. Description of the illustration xe_sql_commands.gif If you want to save the SQL statements for future use, click theSavebutton. ...
The script is parsed during upload. If it has a syntax error, an error icon appears in place of the run icon in the SQL Scripts page Details view. If a script of the same name exists in the Script Repository, you are prompted to rename it. ...
上面的sql中 订单表中(orders) 存在user_id,而又有用户表(users),所以我们用orders表中user_id和user表中的id 来in 和 exists。 结果 1.where后面是小表 (1)select count(1) from orders o where o.user_id in(select u.id from users u); ...
If the result of a string operation on an INFORMATION_SCHEMA column differs from expectations, a workaround is to use an explicit COLLATE clause to force a suitable collation (see Section 1.8.1, “Using COLLATE in SQL Statements”). For example, to perform a case-insensitive search, use COL...
SQL SELECTPurchaseOrderID, EmployeeID, VendorIDFROMPurchaseOrderHeader; The unique values returned by theEmployeeIDcolumn become fields in the final result set. As such, there's a column for eachEmployeeIDnumber specified in the pivot clause, which are employees250,251,256,257, and260in this ...
Cluster to Another GDS-based Cross-Cluster Interconnection Using Kettle to Import Data Using a gsql Meta-Command to Import Data Running the COPY FROM STDIN Statement to Import Data Full Database Migration Real-time Import Metadata Migration Exporting Data Other Operations Developer Guide SQL Syntax ...