之前接觸過一點MySQL數據庫方面的知識，現在在學習Android軟件開發過程中發現SQLite語句與MySQL的語句還是有部分不同，SQLite中的命令不算太多，可以在adb shell中進入App的data文件，之后執行sqite3 數據庫名，進入到sql命令行界面

查詢SQLite的基本命令，輸入".help"得到命令與句列表：

sqlite> .help
.backup ?DB? FILE      Backup DB (default "main") to FILE
.bail on|off           Stop after hitting an error.  Default OFF
.binary on|off         Turn binary output on or off.  Default OFF
.clone NEWDB           Clone data into NEWDB from the existing database
.databases             List names and files of attached databases
.dbinfo ?DB?           Show status information about the database
.dump ?TABLE? ...      Dump the database in an SQL text formatIf TABLE specified, only dump tables matchingLIKE pattern TABLE.
.echo on|off           Turn command echo on or off
.eqp on|off            Enable or disable automatic EXPLAIN QUERY PLAN
.exit                  Exit this program
.explain ?on|off?      Turn output mode suitable for EXPLAIN on or off.With no args, it turns EXPLAIN on.
.fullschema            Show schema and the content of sqlite_stat tables
.headers on|off        Turn display of headers on or off
.help                  Show this message
.import FILE TABLE     Import data from FILE into TABLE
.indexes ?TABLE?       Show names of all indexesIf TABLE specified, only show indexes for tablesmatching LIKE pattern TABLE.
.limit ?LIMIT? ?VAL?   Display or change the value of an SQLITE_LIMIT
.log FILE|off          Turn logging on or off.  FILE can be stderr/stdout
.mode MODE ?TABLE?     Set output mode where MODE is one of:ascii    Columns/rows delimited by 0x1F and 0x1Ecsv      Comma-separated valuescolumn   Left-aligned columns.  (See .width)html     HTML <table> codeinsert   SQL insert statements for TABLEline     One value per linelist     Values delimited by .separator stringstabs     Tab-separated valuestcl      TCL list elements
.nullvalue STRING      Use STRING in place of NULL values
.once FILENAME         Output for the next SQL command only to FILENAME
.open ?FILENAME?       Close existing database and reopen FILENAME
.output ?FILENAME?     Send output to FILENAME or stdout
.print STRING...       Print literal STRING
.prompt MAIN CONTINUE  Replace the standard prompts
.quit                  Exit this program
.read FILENAME         Execute SQL in FILENAME
.restore ?DB? FILE     Restore content of DB (default "main") from FILE
.save FILE             Write in-memory database into FILE
.scanstats on|off      Turn sqlite3_stmt_scanstatus() metrics on or off
.schema ?TABLE?        Show the CREATE statementsIf TABLE specified, only show tables matchingLIKE pattern TABLE.
.separator COL ?ROW?   Change the column separator and optionally the rowseparator for both the output mode and .import
.shell CMD ARGS...     Run CMD ARGS... in a system shell
.show                  Show the current values for various settings
.stats on|off          Turn stats on or off
.system CMD ARGS...    Run CMD ARGS... in a system shell
.tables ?TABLE?        List names of tablesIf TABLE specified, only list tables matchingLIKE pattern TABLE.
.timeout MS            Try opening locked tables for MS milliseconds
.timer on|off          Turn SQL timer on or off
.trace FILE|off        Output each SQL statement as it is run
.vfsname ?AUX?         Print the name of the VFS stack
.width NUM1 NUM2 ...   Set column widths for "column" modeNegative values right-justify

譬如語句“.table”查看當前數據庫下面的表單

語句“select * from MPD;”則與MySQL中檢索所有列的所有內容語句相同，查看某列則是“select id from MPD;”將通配符修改為列名

查看某些行，則加入limit參數，如“select * from MPD limit 3;”顯示第三行以后的所有列數據，“select id from MPD limit 3,3;”顯示第三行以后的三行（4-6行）id列數據

查看當前SQLite的基本配置，輸入命令".show"

之前打印出來的表單沒有顯示列名，因此執行語句“.headers on”，再打印

在MySQL中可以利用“\G”代替“;”，從而使表單以列形式顯示，但是SQLite中不能使用“\G”，修改mode即可

和MySQL相同地，可以使用where子句檢索數據

使用聚集函數AVG()求均值

總結

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