⚡️ SQL СОВЕТ ПРОФИ: EXISTS часто лучше, чем COUNT
0:51
YouTubeUproger / Machine Learning / Ai
⚡️ SQL СОВЕТ ПРОФИ: EXISTS часто лучше, чем COUNT
сли тебе нужно просто проверить, есть ли строки, не заставляй базу считать их все. EXISTS останавливается сразу, как только нашел первую подходящую строку. Для больших таблиц это может быть ...
視聴回数: 2 回1 か月前
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