Update mysql-questions-01.md#2830

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Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
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Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all \u003cpre\u003e\u003ccode\u003e blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks"); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + '
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Merged
Snailclimb merged 1 commit into from
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Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
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Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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Update mysql-questions-01.md#2830

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Merged
Snailclimb merged 1 commit into from
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Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length \u003e 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

Update mysql-questions-01.md#2830

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Merged
Snailclimb merged 1 commit into from
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Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
Skip to content

Update mysql-questions-01.md#2830

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Merged
Snailclimb merged 1 commit into from
Apr 16, 2026
Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

Update mysql-questions-01.md#2830

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Merged
Snailclimb merged 1 commit into from
Apr 16, 2026
Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

Update mysql-questions-01.md#2830

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Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
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Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down
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Merged
Snailclimb merged 1 commit into from
Apr 16, 2026
Merged

Update mysql-questions-01.md #2830

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6 changes: 3 additions & 3 deletions docs/database/mysql/mysql-questions-01.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -82,8 +82,8 @@ MySQL 成功可以归功于在**生态、功能和运维**这三个层面上的

MySQL 字段类型可以简单分为三大类：

- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **数值类型**：整型（TINYINT、SMALLINT、MEDIUMINT、INT 和 BIGINT）、浮点型（FLOAT 和 DOUBLE）、定点型（DECIMAL）、位字段数据类型(BIT)
- **字符串类型**：CHAR、VARCHAR、TINYTEXT、TEXT、MEDIUMTEXT、LONGTEXT、BINARY、TINYBLOB、BLOB、MEDIUMBLOB 和 LONGBLOB 等，最常用的是 CHAR 和 VARCHAR。
- **日期时间类型**：YEAR、TIME、DATE、DATETIME 和 TIMESTAMP 等。

下面这张图不是我画的，忘记是从哪里保存下来的了，总结的还蛮不错的。
Expand DownExpand Up@@ -197,7 +197,7 @@ TIMESTAMP 只需要使用 4 个字节的存储空间，但是 DATETIME 需要耗

### ⭐️Boolean 类型如何表示？

MySQL 中没有专门的布尔类型，而是用 `TINYINT(1)` 类型来表示布尔值。`TINYINT(1)` 类型可以存储 0 或 1，分别对应 false 或 true。
MySQL 中没有专门的布尔类型，而是用 `bit(1)` 类型来表示布尔值。`bit(1)` 类型可以存储 0 或 1，分别对应 false 或 true。

### ⭐️手机号存储用 INT 还是 VARCHAR？

Expand Down