When you want to determine whether a given row includes a comment, you no longer need to check for a null value in the COMMENT column.

确定某一个行是否包含注释时，不再需要检查 COMMENT 列的 null 值。

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You need to check the value of the row in schema_info and look at the state of the database.

需要检查 schema_info 表中行的值，并查看数据库的状态。

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Select the Loop check box, then enter the value of 1 for both the Start row and End row, as shown in Figure 21.

选择Loop复选框，然后为start行和end行都输入值1，如图21所示。

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That recent checkup indicated that McCain's body is free of cancer, marking the fourth check in a row to show him as being cancer-free.

CNN: Sen. McCain to undergo surgery at Mayo Clinic