以下建表语句正确的有（ ） 2分 CREATE TABLE table_b AS SELECT * FROM table_a; CREATE TABLE table_b STORED as ORC_TRANSACTION AS SELECT * FROM table_a; CREATE TABLE table_b STORED as TEXTFILE AS SELECT * FROM table_a; CREATE TABLE table_b STORED as HOLODESK AS SELECT * FROM table_a;

以下表语句中正确的是：

- CREATE TABLE table_b SELECT * FROM table_a;
该语句用创建一个名为table_b的表，将表table_a中的所有数据复制到新表中。

- CREATE table_b STORED as ORC_TRANSACTION AS * FROM table_a;
该语是错误的。ORC_TRANSACTION不是有效的存储格式。

- CREATE TABLE table_b STORED as TEXTFILE AS SELECT * FROM table_a;
该语句是正确的。它创建了一个名为table_b的表，并且将表table_a中的数据以TEXTFILE格式存储到新表中。

- CREATE TABLE table_b STORED as HOLODESK AS SELECT * FROM table_a;
该语句是错误的。HOLODESK不是一个有效的存储格式。

所以，正确的建表语句有两个：
1. CREATE TABLE table_b AS SELECT * FROM table_a;
2. CREATE TABLE table_b STORED as TEXTFILE AS SELECT * FROM table_a;