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1️⃣ Install PostgreSQL sudo apt update sudo apt install postgresql postgresql-contrib ✅ This installs both the server and the psql CLI tool. zzh@ZZHPC
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posted @ 2025-04-21 09:23
ZhangZhihuiAAA
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Cursors in PostgreSQL are used to process query results row by row, which is useful when you can’t—or don’t want to—handle the entire result set at on
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posted @ 2025-04-21 08:59
ZhangZhihuiAAA
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🔹 GREATEST(): Function Returns the largest value from a list of expressions within a row. ✅ Usage: SELECT GREATEST(10, 20, 5); -- Returns 20 📌 In a
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posted @ 2025-04-21 08:53
ZhangZhihuiAAA
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posted @ 2025-04-21 08:17
ZhangZhihuiAAA
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📁 1. General Principles RuleExample Use lowercase with underscores user_profile, not UserProfile or UserProfile Use singular table names user, order,
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posted @ 2025-04-20 16:03
ZhangZhihuiAAA
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pip install jupyter Python Interactive window Jupyter (formerly IPython Notebook) is an open-source project that lets you easily combine Markdown text
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posted @ 2025-04-20 10:38
ZhangZhihuiAAA
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posted @ 2025-04-18 17:23
ZhangZhihuiAAA
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Elasticsearch is a distributed search and analytics engine, scalable data store, and vector database built on Apache Lucene. It’s optimized for speed
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posted @ 2025-04-17 14:47
ZhangZhihuiAAA
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Why does string '10/12/2007' match Python regular expression '\d{2}/\d{2}/\d{4}' but not match '\d{1, 2}/\d{1, 2}/\d{4}'? You might expect it to match
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posted @ 2025-04-15 21:31
ZhangZhihuiAAA
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You can customize it: import pandas as pd pd.options.display.float_format = '{:.2f}'.format ✅ To increase the string display length in Pandas, set the
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posted @ 2025-04-11 17:16
ZhangZhihuiAAA
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