When it detects a potential update target, the federated system avoids using the block fetch feature in order to maintain the remote cursor position.
当检测到一个潜在的更新目标时，联邦系统避免使用块读取特性，以维护远程游标的位置。
Leaving the cursor conveniently in the middle of the newly closed block.
让光标留在一对花括号的中间，从而为输入提供方便。
Position the cursor over a block of SQL text.
将游标置于SQL文字区块上方。
Position the cursor over a block of SQL text.
将游标置于SQL文字区块上方。
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