Choose three Which three statements are true about indexes and their administration in an Oracle database? A) An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on ...

Choose the best answer The CUSTOMERS table has a CUST_LAST_NAME column of data type VARCHAR2. The table has two rows whose COST_LAST_MANE values are Anderson and Ausson. Which query produces output fo ...

Choose two Examine the description of the PRODUCT DETALS table: NAME NULL TYPE -------------------------------------------------- PRODUCT_ID NOT NULL NUMBER(2) PRODUCT_ ...

Choose twoThe CUSTOMERS table has a CUST_CREDT_LIMIT column of data typenumber. Which two queries execute successfully?A) SELECTTO_CHAR(NVL(cust_credit_limit * .15,'Not Available')) FROM customers; B) ...

PgBouncer：是为postgresql数据库提供的一个轻量级连接池工具 *作用： 1. 如果应用程序直接与postgresql连接，则每次连接时postgresql都会克隆（linux及unix下通过fork系统调用）出 一个服务进程来为应用程序 ...

MySQL数据安装 1:百度一下啥安装都有,哈哈...........

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