报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint 问题原因:违反唯一性约束,执行UPDATE、INSERT ON CONFLICT或INSERT操作时,主键存在重复数据。 解决方法: 若INSERT语法报错:可以改为INSERT INTO xx ON CONFLICT的语法,实现主键去重,详情请参见INSERT ON CONFLIC...
• Directives can be used for multiple statements: –Directives are collected on query expressions • They are persisted to disk in the SYSAUX tablespace. • Directives are automatically maintained: –Created as needed during compilation or execution: ––Missing statistics, cardinality misestimates...
95. Which of the below statements are true?Group functions cannot be used against the data from multiple data sources. If multiple tables joined in a query, contain identical columns, Oracle selects only one of them. Natural join is used to join rows from two tables based on identical ...
SQL statements,OpenSearch:query clause The query clause is the most basic and indispensable part of a statement. The query clause defines the specific content to be queried based on a specific index field. You can specify mult...
You cannot add multiple redo log file groups having the same GROUP value. If you omit this parameter, Oracle generates its value automatically. You can examine the GROUP value for a redo log file group through the dynamic performance view V$LOG. redo_log_file_spec Each redo_log_file_spec ...
(triggers or program units). This helps reduce the complexity of SQL by allowing complex logic to be handled in the Forms or Reports. You can also invoke a server side PL/SQL package that performs the few SQL statements in place of a single large complex SQL statement. Because the ...
log_slow_admin_statements:慢速管理语句是否写入慢日志中,管理语句包含ALTER TABLE,ANALYZE TABLE,CHECK TABLE,CREATE INDEX,DROP INDEX,OPTIMIZE TABLE,REPAIR TABLE,默认为OFF即不写入。 一般情况下,我们只需开启慢日志记录,配置下阈值时间,其余参数可按默认配置。对于阈值时间,可灵活调整,比如说可以设置为 1s 或 3s...
Whenever I issue multiple SQL DML statements (like several INSERT statements) in a single query string it fails because there is more than one statement. I don't have this problem with SQL Server. Is there something I can specify in the ODBC DSN or on the MySQL server itself to enable...
Hi, Im beginner in vb.net and I just wanna ask if how can I execute multiple sql queries inside IF END IF.EXAMPLEIF MsgBox("Release Item?", MsgBoxStyle.Question + MsgBoxStyle.YesNo, "") = MsgBoxResult.Yes ThenIF val(paid) = val(totalcost) thenquery = "INSERT INTO tbl_example()...
You create multiple exceptions tables with different names by modifying and resubmitting the script. See Also: The DBMS_IOT package in Oracle9i Supplied PL/SQL Packages and Types Reference for information on the SQL scripts Oracle9i Database Performance Guide and Reference for information on ...