/* MySQL */
SELECT VERSION();
/* Firebird */
SELECT rdb$get_context('SYSTEM', 'ENGINE_VERSION') from rdb$database;
/* PostgreSQL */
SELECT version();
/* SQL Server */
SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(30));
/* SQL AnyWhere */
SELECT TOP 1 version
FROM SYSHISTORY
WHERE operation = 'START'
ORDER BY first_time_utc DESC;
/* sqlite */
select sqlite_version();
/* Oracle */
select * from v$version WHERE ROWNUM = 1;
sqlite3 出来ないことのまとめ
直ぐに使えて、ちょっとしたデータ管理には便利な sqlite ですが、他のデータベースと同じように使うには無理で、機能がない部分が多いです。
- 認証がなく、ユーザーがない
- 他ホストからの接続ができない
- 同時多数接続大量処理 (テーブルがロックして更新出来ないことがある)
- CURRENT_TIMESTAMP がないので、関数を使う
- 列の削除ができない (ALTER TABLE tablename DROP columnname)
- ストアドプロシージャーがない (トリガーはある)
- 文字長がない (文字列型は全部 Text にする)
- 数値型が少ない (INTEGER, REAL, NUMERIC だけ)
- TRANCATE TABLE
- LEFT OUTER JOIN
- ALL, ANY
sqlite3 基本コマンドのまとめ
.table : テーブルの一覧
sqlite> .table
log_apacheaccess log_df log_jstat log_rsyncbackup
log_apachests log_dircntsz log_loadave log_rxtx
log_cpu log_free log_ping log_videoupload
.schema : 指定したテーブルの show create table
sqlite> .schema log_free
CREATE TABLE "log_free" ("tm" timestamp NOT NULL ,"used" integer NOT NULL ,"free" integer NOT NULL );
CREATE UNIQUE INDEX log_free_tm on log_free(tm);
.exit : 終了
.quit : 終了
.show Shell設定状態表示
sqlite> .show
echo: off
explain: off
headers: off
mode: list
nullvalue: ""
output: stdout
separator: "|"
stats: off
width:
sqlite>
.database : 使用中のデータベースを表示
seq name file
--- --------------- ----------------------------------------------------------
0 main /home/sqlite/logs
.help : ヘルプを表示
.backup ?DB? FILE Backup DB (default "main") to FILE
.bail ON|OFF Stop after hitting an error. Default OFF
.databases List names and files of attached databases
.dump ?TABLE? ... Dump the database in an SQL text format
If TABLE specified, only dump tables matching
LIKE pattern TABLE.
.echo ON|OFF Turn command echo on or off
.exit Exit this program
.explain ?ON|OFF? Turn output mode suitable for EXPLAIN on or off.
With no args, it turns EXPLAIN on.
.header(s) ON|OFF Turn display of headers on or off
.help Show this message
.import FILE TABLE Import data from FILE into TABLE
.indices ?TABLE? Show names of all indices
If TABLE specified, only show indices for tables
matching LIKE pattern TABLE.
.load FILE ?ENTRY? Load an extension library
.log FILE|off Turn logging on or off. FILE can be stderr/stdout
.mode MODE ?TABLE? Set output mode where MODE is one of:
csv Comma-separated values
column Left-aligned columns. (See .width)
html HTML <table> code
insert SQL insert statements for TABLE
line One value per line
list Values delimited by .separator string
tabs Tab-separated values
tcl TCL list elements
.nullvalue STRING Use STRING in place of NULL values
.output FILENAME Send output to FILENAME
.output stdout Send output to the screen
.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
.schema ?TABLE? Show the CREATE statements
If TABLE specified, only show tables matching
LIKE pattern TABLE.
.separator STRING Change separator used by output mode and .import
.show Show the current values for various settings
.stats ON|OFF Turn stats on or off
.tables ?TABLE? List names of tables
If TABLE specified, only list tables matching
LIKE pattern TABLE.
.timeout MS Try opening locked tables for MS milliseconds
.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" mode
.timer ON|OFF Turn the CPU timer measurement on or off
詳しくは : https://qiita.com/sotetsuk/items/cd2aeae4ba7e72faad47