Table of Contents for
Using SQLite

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition Using SQLite by Jay A. Kreibich Published by O'Reilly Media, Inc., 2010
  1. Cover
  2. Using SQLite
  3. O'Reilly Strata Conference
  4. Using SQLite
  5. Dedication
  6. A Note Regarding Supplemental Files
  7. Preface
  8. SQLite Versions
  9. Email Lists
  10. Example Code Download
  11. How We Got Here
  12. Conventions Used in This Book
  13. Using Code Examples
  14. Safari® Books Online
  15. How to Contact Us
  16. 1. What Is SQLite?
  17. Self-Contained, No Server Required
  18. Single File Database
  19. Zero Configuration
  20. Embedded Device Support
  21. Unique Features
  22. Compatible License
  23. Highly Reliable
  24. 2. Uses of SQLite
  25. Database Junior
  26. Application Files
  27. Application Cache
  28. Archives and Data Stores
  29. Client/Server Stand-in
  30. Teaching Tool
  31. Generic SQL Engine
  32. Not the Best Choice
  33. Big Name Users
  34. 3. Building and Installing SQLite
  35. SQLite Products
  36. Precompiled Distributions
  37. Documentation Distribution
  38. Source Distributions
  39. Building
  40. Build and Installation Options
  41. An sqlite3 Primer
  42. Summary
  43. 4. The SQL Language
  44. Learning SQL
  45. Brief Background
  46. General Syntax
  47. SQL Data Languages
  48. Data Definition Language
  49. Data Manipulation Language
  50. Transaction Control Language
  51. System Catalogs
  52. Wrap-up
  53. 5. The SELECT Command
  54. SQL Tables
  55. The SELECT Pipeline
  56. Advanced Techniques
  57. SELECT Examples
  58. What’s Next
  59. 6. Database Design
  60. Tables and Keys
  61. Common Structures and Relationships
  62. Normal Form
  63. Indexes
  64. Transferring Design Experience
  65. Closing
  66. 7. C Programming Interface
  67. API Overview
  68. Library Initialization
  69. Database Connections
  70. Prepared Statements
  71. Bound Parameters
  72. Convenience Functions
  73. Result Codes and Error Codes
  74. Utility Functions
  75. Summary
  76. 8. Additional Features and APIs
  77. Date and Time Features
  78. ICU Internationalization Extension
  79. Full-Text Search Module
  80. R*Trees and Spatial Indexing Module
  81. Scripting Languages and Other Interfaces
  82. Mobile and Embedded Development
  83. Additional Extensions
  84. 9. SQL Functions and Extensions
  85. Scalar Functions
  86. Aggregate Functions
  87. Collation Functions
  88. SQLite Extensions
  89. 10. Virtual Tables and Modules
  90. Introduction to Modules
  91. Module API
  92. Simple Example: dblist Module
  93. Advanced Example: weblog Module
  94. Best Index and Filter
  95. Wrap-Up
  96. A. SQLite Build Options
  97. Shell Directives
  98. ENABLE_READLINE
  99. Default Values
  100. SQLITE_DEFAULT_AUTOVACUUM
  101. SQLITE_DEFAULT_CACHE_SIZE
  102. SQLITE_DEFAULT_FILE_FORMAT
  103. SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT
  104. SQLITE_DEFAULT_MEMSTATUS
  105. SQLITE_DEFAULT_PAGE_SIZE
  106. SQLITE_DEFAULT_TEMP_CACHE_SIZE
  107. YYSTACKDEPTH
  108. Sizes and Limits
  109. SQLITE_MAX_ATTACHED
  110. SQLITE_MAX_COLUMN
  111. SQLITE_MAX_COMPOUND_SELECT
  112. SQLITE_MAX_DEFAULT_PAGE_SIZE
  113. SQLITE_MAX_EXPR_DEPTH
  114. SQLITE_MAX_FUNCTION_ARG
  115. SQLITE_MAX_LENGTH
  116. SQLITE_MAX_LIKE_PATTERN_LENGTH
  117. SQLITE_MAX_PAGE_COUNT
  118. SQLITE_MAX_PAGE_SIZE
  119. SQLITE_MAX_SQL_LENGTH
  120. SQLITE_MAX_TRIGGER_DEPTH
  121. SQLITE_MAX_VARIABLE_NUMBER
  122. Operation and Behavior
  123. SQLITE_CASE_SENSITIVE_LIKE
  124. SQLITE_HAVE_ISNAN
  125. SQLITE_OS_OTHER
  126. SQLITE_SECURE_DELETE
  127. SQLITE_THREADSAFE
  128. SQLITE_TEMP_STORE
  129. Debug Settings
  130. SQLITE_DEBUG
  131. SQLITE_MEMDEBUG
  132. Enable Extensions
  133. SQLITE_ENABLE_ATOMIC_WRITE
  134. SQLITE_ENABLE_COLUMN_METADATA
  135. SQLITE_ENABLE_FTS3
  136. SQLITE_ENABLE_FTS3_PARENTHESIS
  137. SQLITE_ENABLE_ICU
  138. SQLITE_ENABLE_IOTRACE
  139. SQLITE_ENABLE_LOCKING_STYLE
  140. SQLITE_ENABLE_MEMORY_MANAGEMENT
  141. SQLITE_ENABLE_MEMSYS3
  142. SQLITE_ENABLE_MEMSYS5
  143. SQLITE_ENABLE_RTREE
  144. SQLITE_ENABLE_STAT2
  145. SQLITE_ENABLE_UPDATE_DELETE_LIMIT
  146. SQLITE_ENABLE_UNLOCK_NOTIFY
  147. YYTRACKMAXSTACKDEPTH
  148. Limit Features
  149. SQLITE_DISABLE_LFS
  150. SQLITE_DISABLE_DIRSYNC
  151. SQLITE_ZERO_MALLOC
  152. Omit Core Features
  153. B. sqlite3 Command Reference
  154. Command-Line Options
  155. Interactive Dot-Commands
  156. .backup
  157. .bail
  158. .databases
  159. .dump
  160. .echo
  161. .exit
  162. .explain
  163. .headers
  164. .help
  165. .import
  166. .indices
  167. .iotrace
  168. .load
  169. .log
  170. .mode
  171. .nullvalue
  172. .output
  173. .prompt
  174. .quit
  175. .read
  176. .restore
  177. .schema
  178. .separator
  179. .show
  180. .tables
  181. .timeout
  182. .timer
  183. .width
  184. C. SQLite SQL Command Reference
  185. SQLite SQL Commands
  186. ALTER TABLE
  187. ANALYZE
  188. ATTACH DATABASE
  189. BEGIN TRANSACTION
  190. COMMIT TRANSACTION
  191. CREATE INDEX
  192. CREATE TABLE
  193. CREATE TRIGGER
  194. CREATE VIEW
  195. CREATE VIRTUAL TABLE
  196. DELETE
  197. DETACH DATABASE
  198. DROP INDEX
  199. DROP TABLE
  200. DROP TRIGGER
  201. DROP VIEW
  202. END TRANSACTION
  203. EXPLAIN
  204. INSERT
  205. PRAGMA
  206. REINDEX
  207. RELEASE SAVEPOINT
  208. REPLACE
  209. ROLLBACK TRANSACTION
  210. SAVEPOINT
  211. SELECT
  212. UPDATE
  213. VACUUM
  214. D. SQLite SQL Expression Reference
  215. Literal Expressions
  216. Logic Representations
  217. Unary Expressions
  218. Binary Expressions
  219. Function Calls
  220. Column Names
  221. General Expressions
  222. AND
  223. BETWEEN
  224. CASE
  225. CAST
  226. COLLATE
  227. EXISTS
  228. GLOB
  229. IN
  230. IS
  231. ISNULL
  232. LIKE
  233. MATCH
  234. NOTNULL
  235. OR
  236. RAISE
  237. REGEXP
  238. SELECT
  239. E. SQLite SQL Function Reference
  240. Scalar Functions
  241. abs()
  242. changes()
  243. coalesce()
  244. date()
  245. datetime()
  246. glob()
  247. ifnull()
  248. hex()
  249. julianday()
  250. last_insert_rowid()
  251. length()
  252. like()
  253. load_extension()
  254. lower()
  255. ltrim()
  256. match()
  257. max()
  258. min()
  259. nullif()
  260. quote()
  261. random()
  262. randomblob()
  263. regex()
  264. replace()
  265. round()
  266. rtrim()
  267. sqlite_compileoption_get()
  268. sqlite_compileoption_used()
  269. sqlite_source_id()
  270. sqlite_version()
  271. strftime()
  272. substr()
  273. time()
  274. total_changes()
  275. trim()
  276. typeof()
  277. upper()
  278. zeroblob()
  279. Aggregate Functions
  280. avg()
  281. count()
  282. group_concat()
  283. max()
  284. min()
  285. sum()
  286. total()
  287. F. SQLite SQL PRAGMA Reference
  288. SQLite PRAGMAs
  289. auto_vacuum
  290. cache_size
  291. case_sensitive_like
  292. collation_list
  293. count_changes
  294. database_list
  295. default_cache_size
  296. encoding
  297. foreign_keys
  298. foreign_key_list
  299. freelist_count
  300. full_column_names
  301. fullfsync
  302. ignore_check_constraints
  303. incremental_vacuum
  304. index_info
  305. index_list
  306. integrity_check
  307. journal_mode
  308. journal_size_limit
  309. legacy_file_format
  310. locking_mode
  311. lock_proxy_file
  312. lock_status
  313. max_page_count
  314. omit_readlock
  315. page_count
  316. page_size
  317. parser_trace
  318. quick_check
  319. read_uncommitted
  320. recursive_triggers
  321. reverse_unordered_selects
  322. schema_version
  323. secure_delete
  324. short_column_names
  325. sql_trace
  326. synchronous
  327. table_info
  328. temp_store
  329. temp_store_directory
  330. user_version
  331. vdbe_trace
  332. vdbe_listing
  333. writable_schema
  334. G. SQLite C API Reference
  335. API Datatypes
  336. sqlite3
  337. sqlite3_backup
  338. sqlite3_blob
  339. sqlite3_context
  340. sqlite3_int64, sqlite3_uint64, sqlite_int64, sqlite_uint64
  341. sqlite3_module
  342. sqlite3_mutex
  343. sqlite3_stmt
  344. sqlite3_value
  345. sqlite3_vfs
  346. API Functions
  347. sqlite3_aggregate_context()
  348. sqlite3_auto_extension()
  349. sqlite3_backup_finish()
  350. sqlite3_backup_init()
  351. sqlite3_backup_pagecount()
  352. sqlite3_backup_remaining()
  353. sqlite3_backup_step()
  354. sqlite3_bind_xxx()
  355. sqlite3_bind_parameter_count()
  356. sqlite3_bind_parameter_index()
  357. sqlite3_bind_parameter_name()
  358. sqlite3_blob_bytes()
  359. sqlite3_blob_close()
  360. sqlite3_blob_open()
  361. sqlite3_blob_read()
  362. sqlite3_blob_write()
  363. sqlite3_busy_handler()
  364. sqlite3_busy_timeout()
  365. sqlite3_changes()
  366. sqlite3_clear_bindings()
  367. sqlite3_close()
  368. sqlite3_collation_needed()
  369. sqlite3_column_xxx()
  370. sqlite3_column_bytes()
  371. sqlite3_column_count()
  372. sqlite3_column_database_name()
  373. sqlite3_column_decltype()
  374. sqlite3_column_name()
  375. sqlite3_column_origin_name()
  376. sqlite3_column_table_name()
  377. sqlite3_column_type()
  378. sqlite3_commit_hook()
  379. sqlite3_compileoption_get()
  380. sqlite3_compileoption_used()
  381. sqlite3_complete()
  382. sqlite3_config()
  383. sqlite3_context_db_handle()
  384. sqlite3_create_collation()
  385. sqlite3_create_function()
  386. sqlite3_create_module()
  387. sqlite3_data_count()
  388. sqlite3_db_config()
  389. sqlite3_db_handle()
  390. sqlite3_db_mutex()
  391. sqlite3_db_status()
  392. sqlite3_declare_vtab()
  393. sqlite3_enable_load_extension()
  394. sqlite3_enable_shared_cache()
  395. sqlite3_errcode()
  396. sqlite3_errmsg()
  397. sqlite3_exec()
  398. sqlite3_extended_errcode()
  399. sqlite3_extended_result_codes()
  400. sqlite3_file_control()
  401. sqlite3_finalize()
  402. sqlite3_free()
  403. sqlite3_free_table()
  404. sqlite3_get_autocommit()
  405. sqlite3_get_auxdata()
  406. sqlite3_get_table()
  407. sqlite3_initialize()
  408. sqlite3_interrupt()
  409. sqlite3_last_insert_rowid()
  410. sqlite3_libversion()
  411. sqlite3_libversion_number()
  412. sqlite3_limit()
  413. sqlite3_load_extension()
  414. sqlite3_log()
  415. sqlite3_malloc()
  416. sqlite3_memory_highwater()
  417. sqlite3_memory_used()
  418. sqlite3_mprintf()
  419. sqlite3_mutex_alloc()
  420. sqlite3_mutex_enter()
  421. sqlite3_mutex_free()
  422. sqlite3_mutex_held()
  423. sqlite3_mutex_leave()
  424. sqlite3_mutex_notheld()
  425. sqlite3_mutex_try()
  426. sqlite3_next_stmt()
  427. sqlite3_open()
  428. sqlite3_open_v2()
  429. sqlite3_overload_function()
  430. sqlite3_prepare_xxx()
  431. sqlite3_profile()
  432. sqlite3_progress_handler()
  433. sqlite3_randomness()
  434. sqlite3_realloc()
  435. sqlite3_release_memory()
  436. sqlite3_reset()
  437. sqlite3_reset_auto_extension()
  438. sqlite3_result_xxx()
  439. sqlite3_result_error_xxx()
  440. sqlite3_rollback_hook()
  441. sqlite3_set_authorizer()
  442. sqlite3_set_auxdata()
  443. sqlite3_shutdown()
  444. sqlite3_sleep()
  445. sqlite3_snprintf()
  446. sqlite3_soft_heap_limit()
  447. sqlite3_sourceid()
  448. sqlite3_sql()
  449. sqlite3_status()
  450. sqlite3_step()
  451. sqlite3_stmt_status()
  452. sqlite3_strnicmp()
  453. sqlite3_table_column_metadata()
  454. sqlite3_threadsafe()
  455. sqlite3_total_changes()
  456. sqlite3_trace()
  457. sqlite3_unlock_notify()
  458. sqlite3_update_hook()
  459. sqlite3_user_data()
  460. sqlite3_value_xxx()
  461. sqlite3_value_bytes()
  462. sqlite3_value_numeric_type()
  463. sqlite3_value_type()
  464. sqlite3_version[]
  465. sqlite3_vfs_find()
  466. sqlite3_vfs_register()
  467. sqlite3_vfs_unregister()
  468. sqlite3_vmprintf()
  469. Index
  470. About the Author
  471. Colophon
  472. Copyright

Name

avg() — Compute the numerical average

Common Usage

avg( number )

Description

The avg() aggregate computes the average (mean) numeric value for all non-NULL number values. The aggregate attempts to convert any text or BLOB values into a numeric value. If a conversion is not possible, those rows will be counted with a value of 0.

If all the number values are NULL, avg() will return a NULL.

See Also

count(), sum(), total()