Oracle - EXCEPTION WHEN NO_DATA_FOUND THEN stmts..; MySQL - DECLARE CONTINUE HANDLER FOR NOT FOUND stmts..; -- Set a variable here like SET not_found =1 Check for the variable, to decide the error condition, when running the query. ...
Querying Data at a Point in Time (Flashback Query)Although some Oracle tools and applications simplify or mask the use of SQL, all database operations are performed using SQL, to take advantage of the security and data integrity features built into Oracle.Overview...
To group rows into part of a datetime value withOracle SQLyou can use thetruncfunction. This rounds down datetime values. The first argument is the datetime and the second is the units to round down to. For example, this groups the rows by hour: Copy code snippet Copied to Clipboard Erro...
Microsoft SQL Server is a relational database management system. The purpose of the system is to manage and store information. The system supports various business intelligence, analytics, and transaction processing operations. Oracle is a computer technology company known for its Java-based software ...
DECODE function or CASE expressions, but the technique was quite cumbersome and time-consuming. The pivot feature saves you extra effort writing complex SQL and allows reorganizing your data and viewing it in a concise format. Let's review the basic functions in Oracle related to the PIVOT ...
TheONLYway to get a specific orderisto use anORDER BY. http://stackoverflow.com/questions/20186673/in-oracle-11g-how-to-change-the-order-of-the-results-of-a-sql-without-order-by rowid是标识行的唯一性,格式:data object number(6个字符)+relative file number(3个字符)+block number(6个字符)...
Oracle Database Performance Tuning Understanding ORA-04031 TheORA-04031: unable to allocate bytes of shared memoryerror occurs because more shared memory was needed than was available. The error message will show how much memory was unavailable, the memory pool encountering the error and details about...
description => 'Tuning task for an EMP to DEPARTMENT join query.'); DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id); END; / You should see the following: PL/SQL procedure successfully completed. In the preceding command, note the TIME_LIMIT of 60. That limits...
The main string data types in Oracle are: CHAR NCHAR VARCHAR2 NVARCHAR2 TEXT TheTO_CHAR functiontakes a value and converts it to a TEXT data type. It works in a similar way to TO_NUMBER, but has a few parameters. TO_CHAR(expression,[format,][options]) ...
However, if I run those sql statement in MySQL DB server, it just simply throw the syntax error. Could you please let me know why these sql statement cannot work on MySQL and how to migrate them from Oracle to MySQL? Thanks in advance for the reply! Here are the statements: ...