FROM movie JOIN casting ON movie.id=movieid JOIN actor ON actorid=actor.id WHERE name='John Travolta' GROUP BY yr ) AS t ) 法二:(最好用此方法) SELECT yr,COUNT(title) FROM movie JOIN casting ON movie.id=movieid JOIN actor ON actorid=actor.id WHERE name='John Travolta' GROUP BY ...
Number of sort operations that were performed completely in memory and did not require any disk writes You cannot do much better than memory sorts, except maybe no sorts at all. Sorting is usually caused by selection criteria specifications within table join SQL operations. Sorts(disk): 在磁盘...
以下练习来自SQLZOO《More JOIN operations》: 《SQLZOO——More JOIN operation》练习题8:顯示電影異型'Alien' 的演員清單。大于两张表查询时可以通过建立子查询来查询其他表的信息 SELECT name FROM actor WHERE id IN ( SELECT actorid FROM movie as m JOIN casting as c ON m.id = c.movieid WHERE id ...
select quantity,account_quantity,superior_quantity,card_start,card_end,card_type,ta.remark,ta.sid,card_Name,card_Description from Card_Type join (select quantity,account_quantity,superior_quantity,card_start,card_end,card_type,remark,sid from Card_Apply_detail wherecard_apply_sid=@sid) as ta on...
SQL_POS_OPERATIONS SQL_POSITIONED_STATEMENTS SQL_SCROLL_CONCURRENCY SQL_STATIC_SENSITIVITY 信息类型说明 下表按字母顺序列出每种信息类型、引入它的 ODBC 版本及其说明。 展开表 信息类型ODBC 版本说明 SQL_ACCESSIBLE_PROCEDURES 1.0 字符串:如果用户可以执行 SQLProcedures 返回的所有过程,则为“Y”;如果可能返回...
(DM)为 StatementHandle调用了 SQLExecute、SQLExecDirect、SQLBulkOperations或SQLSetPos,并返回了SQL_NEED_DATA。 在为所有数据执行参数或列发送数据之前调用此函数。 HY013内存管理错误无法处理函数调用,因为基础内存对象无法访问,可能是因为内存条件低。
SQL_POS_OPERATIONS 2.0 An SQLINTEGER bitmask enumerating the support operations in SQLSetPos.The following bitmasks are used together with the flag to determine which options are supported.SQL_POS_POSITION (ODBC 2.0)SQL_POS_REFRESH (ODBC 2.0)SQL_POS_UPDATE (ODBC 2.0)SQL_POS_DELETE (ODBC 2.0...
也可以显示的使用JOIN子句 select e.ename, d.loc from emp e inner join dept d on (e.deptno = d.deptno) where e.deptno = 10 1. 2. 3. 如果希望把join逻辑放在FROM中, 而不是WHERE中,可使用JOIN字句,两种方法都符合ANSI标准 3. 在两个表中查找共同行 ...
Link:https://www.oracle.com/in/database/ 11) DynamoDB Amazon DynamoDB is a top-notch nonrelational database system that I analyzed. The low latency is impressive and makes it ideal for large-scale operations. I appreciate the built-in security and memory caching it offers. I found it he...
Index and table scans are expensive I/O operations. min(/MSSQL by Zabbix agent 2/mssql.scan_to_search,15m) > 0.001 Warning LLD rule Database discovery NameDescriptionTypeKey and additional info Database discovery Scanning databases in DBMS. Dependent item mssql.database.discovery Preprocessing...