WHEN MATCHED THEN <update_clause> WHEN NOT MATCHED THEN <insert_clause>; multiTable Inserts功能: Multitable inserts allow a single INSERT INTO .. SELECT statement to conditionally, or non-conditionally, insert into multiple tables. This statement reduces table scans and PL/SQL code necessary for ...
SQL JOIN其实是一个逻辑概念,像NEST LOOP JOIN、 HASH JOIN等是表连接的物理实现方式。 我们先准备一个两个测试表M与N(仅仅是为了演示需要),如下脚本所示 SQL> CREATE TABLE M 1. 2 ( 1. 3 NAME VARCHAR2(12) 1. 4 ,SEX VARCHAR2(6) 1. 5 ); 1. 1. Table created. 1. 1. SQL> CREATE TABL...
elect sql_textfromv$sqltext awherea.hash_value=(selectsql_hash_valuefromv$session bwhereb.sid='&sid')orderbypieceasc select a.CPU_TIME,--CPU时间 百万分之一(微秒)a.OPTIMIZER_MODE,--优化方式a.EXECUTIONS,--执行次数a.DISK_READS,--读盘次数a.SHARABLE_MEM,--占用shared pool的内存多少a.BUFFER...
view=sql-server-ver16 Once it is done set the following in the /etc/odbcinst.ini file by adjusting the SQL Server ODBC driver version: [msodbcsql18] Description=Microsoft ODBC Driver 18 for SQL Server Driver=/opt/microsoft/msodbcsql18/lib64/libmsodbcsql-18.0.so.1.1 UsageCount=1 See O...
The PL/SQL block in Example 6-10 queries multiple values into PL/SQL tables, with and without bulk binds. Without bulk bind, PL/SQL sends a SQL statement to the SQL engine for each selected employee, leading to context switches that slow performance. ...
如果该窗口尚未打开,从 Solution Explorer 中打开 multiple_row_change.sql。 2. 从multiple_row_change.sql 中选择以下代码。 按CTRL+C 复制该代码。 Update employees set salary=salary+10 where employee_id=200 or employee_id=201; commit; 在Server Explorer 中,右键单击 HR.ORCL 并选择 Query Window。
Truly achieve zero SQL ORM table building, index and CRUD all support Support.NET millions of big data write, update, subtable and has billions of query statistics mature solutions Support SAAS complete application: cross-database query, audit, tenant sub-database, tenant sub-table and tenant ...
If you modify any of the base tables for a view so that they no longer can be used for a view, that view itself can no longer be used. In general, you can write to the columns of only one underlying base table of a view in a single SQL statement. There are additional restrictions...
Using PL/SQLWhat is Dynamic SQL?Most database applications do a specific job. For example, a simple program might prompt the user for an employee number, then update rows in the EMP and DEPT tables. In this case, you know the makeup of the UPDATE statement at precompile time. That is...
Insert, update and delete data Support for CLOBs and BLOBs Auto-fit columns Track data changes through message log Visual Query Builder Use the Query Builder to quickly create SQL queries by drag and drop, to select tables, and mouse-click to select columns. ...