Examine the following commands and their output: SQL> SELECT ename, sal FROM emp WHERE ename='JAMES'; ENAME SAL JAMES 1050 QL> UPDATE emp SET sal=sal+sal*1.2 WHERE ename='JAMES'; 1 row updated. SQL> SELECT ename, sal FROM emp WHERE ename='JAMES'; ENAME SAL JAMES 2310 View the exhibit and examine the Flashback Version Query that was executed after the preceding commands. What could be the possible cause for the query not displaying any row?（） Flashback logging is not enabled for the database.。 The changes made to the table are not committed.。 Supplemental logging is not enabled for the database.。 The database is not configured in ARCHIVELOG mode.。
砖砌体工程中可设置脚手眼的墙体或部位是（）。 120mm厚墙。 砌体门窗洞口两侧450mm处。 独立柱。 宽度为800mm的窗间墙。
群体动力理论的创始人是心理学家（），该理论又被称为"场"理论。 霍尔（Hall）。 勒温（Lewin）。 琼斯（Jeass）。 凯利（Kelley）。
土壤粘结性
Which of the following best describes the lock protection provided by DB2 for the current row of a cursor?（） The cursor is only protected from updates and deletes by concurrent applications.。 The row is only protected from positioned updates and deletes that reference another cursor of the same application.。 The cursor is protected from positioned updates and deletes that reference another cursor of a different application.。 The row is protected from updates and deletes by the current application and from positioned updates and deletes that reference another cursor of the same application.。
不属于优化行为的是（）
