外部結合しているテーブルの行をを一度に消す方法はないのでしょうか？ delete TBL_A from TBL_A left join TBL_B on TBL_A.keyid = TBL_B.id where TBL_B.keyid = 4; や delete from TBL_A from TBL_A left join TBL_B on TBL_A.keyid = TBL_B.id where TBL_B.keyid = 4; など紹介されているものを色々試してみたのですが、どうしてもsyntaxerrorがdelete直後の単語ででてしまいます。 テーブルごとに削除するしかないのでしょうか…？
The phrase "VALUES(expr-list)" means the same thing as "SELECT expr-list". The phrase "VALUES(expr-list-1),...,(expr-list-N)" means the same thing as "SELECT expr-list-1 UNION ALL ... UNION ALL SELECT expr-list-N". There is no advantage to using one form over the other. Both forms yield the same result and both forms use the same amount of memory and processing time.
There are some restrictions on the use of a VALUES clause that are not shown on the syntax diagrams:
A VALUES clause cannot be followed by ORDER BY or LIMIT. A VALUES clause cannot be used together with a WITH clause in a simple SELECT.
Added support for partial sorting by index. Enhance the query planner so that it always prefers an index that uses a superset of WHERE clause terms relative to some other index. Improvements to the automerge command of FTS4 to better control the index size for a full-text index that is subject to a large number of updates. Added the sqlite3_rtree_query_callback() interface to R-Tree extension Added new URI query parameters "nolock" and "immutable". Use less memory by not remembering CHECK constraints on read-only database connections. Enable the OR optimization for WITHOUT ROWID tables. Render expressions of the form "x IN (?)" (with a single value in the list on the right-hand side of the IN operator) as if they where "x==?", Similarly optimize "x NOT IN (?)" Add the ".system" and ".once" commands to the command-line shell. Added the SQLITE_IOCAP_IMMUTABLE bit to the set of bits that can be returned by the xDeviceCharacteristics method of a VFS. Added the SQLITE_TESTCTRL_BYTEORDER test control.
377NAME IS NULL2014/06/18(水) 11:06:47.42ID:/pFl4NPD
SELECT sample_id FROM user_list ORDER BY RANDOM() LIMIT 3;
・Added support for hexadecimal integer literals in the SQL parser. (Ex: 0x123abc) ・Enhanced the PRAGMA integrity_check command to detect UNIQUE and NOT NULL constraint violations. ・Increase the maximum value of SQLITE_MAX_ATTACHED from 62 to 125. ・Increase the timeout in WAL mode before issuing an SQLITE_PROTOCOL error from 1 second to 10 seconds. ・Added the likely(X) SQL function. ・The unicode61 tokenizer is now included in FTS4 by default. ・Trigger automatic reprepares on all prepared statements when ANALYZE is run. ・Added a new loadable extension source code file to the source tree: fileio.c ・Add extension functions readfile(X) and writefile(X,Y) (using code copy/pasted from fileio.c in the previous bullet) to the command-line shell. ・Added the .fullschema dot-command to the command-line shell.
Performance Enhancements: Many micro-optimizations result in 20.3% more work for the same number of CPU cycles relative to the previous release. The cumulative performance increase since version 3.8.0 is 61%. (Measured using cachegrind on the speedtest1.c workload on Ubuntu 13.10 x64 with gcc 4.8.1 and -Os. Your performance may vary.) The sorter can use auxiliary helper threads to increase real-time response. This feature is off by default and may be enabled using the PRAGMA threads command or the SQLITE_DEFAULT_WORKER_THREADS compile-time option. Enhance the skip-scan optimization so that it is able to skip index terms that occur in the middle of the index, not just as the left-hand side of the index. Improved optimization of CAST operators. Various improvements in how the query planner uses sqlite_stat4 information to estimate plan costs.
New Features: Added new interfaces with 64-bit length parameters: sqlite3_malloc64(), sqlite3_realloc64(), sqlite3_bind_blob64(), sqlite3_result_blob64(), sqlite3_bind_text64(), and sqlite3_result_text64(). Added the new interface sqlite3_msize() that returns the size of a memory allocation obtained from sqlite3_malloc64() and its variants. Added the SQLITE_LIMIT_WORKER_THREADS option to sqlite3_limit() and PRAGMA threads command for configuring the number of available worker threads. The spellfix1 extension allows the application to optionally specify the rowid for each INSERT. Added the User Authentication extension.
Bug Fixes: Fix a bug in the partial index implementation that might result in an incorrect answer if a partial index is used in a subquery or in a view. Ticket 98d973b8f5. Fix a query planner bug that might cause a table to be scanned in the wrong direction (thus reversing the order of output) when a DESC index is used to implement the ORDER BY clause on a query that has an identical GROUP BY clause. Ticket ba7cbfaedc7e6. Fix a bug in sqlite3_trace() that was causing it to sometimes fail to print an SQL statement if that statement needed to be re-prepared. Ticket 11d5aa455e0d98f3c1e6a08 Fix a faulty assert() statement. Ticket 369d57fb8e5ccdff06f1
In PRAGMA journal_mode=TRUNCATE mode, call fsync() immediately after truncating the journal file to ensure that the transaction is durable across a power loss. Fix an assertion fault that can occur when updating the NULL value of a field at the end of a table that was added using ALTER TABLE ADD COLUMN. Do not attempt to use the strchrnul() function from the standard C library unless the HAVE_STRCHRNULL compile-time option is set. Fix a couple of problems associated with running an UPDATE or DELETE on a VIEW with a rowid in the WHERE clause.
420NAME IS NULL2014/11/19(水) 22:18:26.92ID:+solJAhq
SQLite Release 188.8.131.52 On 2014-11-19 (184.108.40.206)
・Enhance the ROLLBACK command so that pending queries are allowed to continue as long as the schema is unchanged. Formerly, a ROLLBACK would cause all pending queries to fail with an SQLITE_ABORT or SQLITE_ABORT_ROLLBACK error. That error is still returned if the ROLLBACK modifies the schema. ・Bug fix: Make sure that NULL results from OP_Column are fully and completely NULL and do not have the MEM_Ephem bit set. Ticket 094d39a4c95ee4. ・Bug fix: The %c format in sqlite3_mprintf() is able to handle precisions greater than 70. ・Bug fix: Do not automatically remove the DISTINCT keyword from a SELECT that forms the right-hand side of an IN operator since it is necessary if the SELECT also contains a LIMIT. Ticket db87229497.
>Optional LIMIT and ORDER BY clauses > >If SQLite is compiled with the SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option, >then the syntax of the DELETE statement is extended by the addition of optional >ORDER BY and LIMIT clauses:
・Added the PRAGMA data_version command that can be used to determine if a database file has been modified by another process. ・Added the SQLITE_CHECKPOINT_TRUNCATE option to the sqlite3_wal_checkpoint_v2() interface, with corresponding enhancements to PRAGMA wal_checkpoint. ・Added the sqlite3_stmt_scanstatus() interface, available only when compiled with SQLITE_ENABLE_STMT_SCANSTATUS. ・The sqlite3_table_column_metadata() is enhanced to work correctly on WITHOUT ROWID tables and to check for the existence of a a table if the column name parameter is NULL. The interface is now also included in the build by default, without requiring the SQLITE_ENABLE_COLUMN_METADATA compile-time option. ・Added the SQLITE_ENABLE_API_ARMOR compile-time option. ・Added the SQLITE_REVERSE_UNORDERED_SELECTS compile-time option. ・Added the SQLITE_SORTER_PMASZ compile-time option and SQLITE_CONFIG_PMASZ start-time option. ・Added the SQLITE_CONFIG_PCACHE_HDRSZ option to sqlite3_config() which makes it easier for applications to determine the appropriate amount of memory for use with SQLITE_CONFIG_PAGECACHE. ・The number of rows in a VALUES clause is no longer limited by SQLITE_LIMIT_COMPOUND_SELECT. ・Added the eval.c loadable extension that implements an eval() SQL function that will recursively evaluate SQL.
・Fix a bug in the sorting logic, present since version 3.8.4, that can cause output to appear in the wrong order on queries that contains an ORDER BY clause, a LIMIT clause, and that have approximately 60 or more columns in the result set. Ticket f97c4637102a3ae72b79.
447NAME IS NULL2015/05/09(土) 17:01:37.72ID:ZgDS20Jy
SQLite Release 3.8.10 On 2015-05-07
Added the sqldiff.exe utility program for computing the differences between two SQLite database files. Added the y format string to the matchinfo() function of FTS3. Performance improvements for ORDER BY, VACUUM, CREATE INDEX, PRAGMA integrity_check, and PRAGMA quick_check. Fix many obscure problems discovered while SQL fuzzing. Identify all methods for important objects in the interface documentation. (example) Made the American Fuzzy Lop fuzzer a standard part of SQLite's testing strategy. Add the ".binary" and ".limits" commands to the command-line shell. Make the "dbstat" virtual table part of standard builds when compiled with the SQLITE_ENABLE_DBSTAT_VTAB option.
448NAME IS NULL2015/05/25(月) 10:34:24.59ID:aYoHQFUg
・Fix a boundary condition error introduced by version 3.12.0 that can result in a crash during heavy SAVEPOINT usage. Ticket 7f7f8026eda38. ・Fix views so that they inherit column datatypes from the table that they are defined against, when possible. ・Fix the query planner so that IS and IS NULL operators are able to drive an index on a LEFT OUTER JOIN.
・Fix a backwards compatibility problem in version 3.12.0 and 3.12.1: Columns declared as "INTEGER" PRIMARY KEY (with quotes around the datatype keyword) where not being recognized as an INTEGER PRIMARY KEY, which resulted in an incompatible database file. Ticket 7d7525cb01b68 ・Fix a bug (present since version 3.9.0) that can cause the DELETE operation to miss rows if PRAGMA reverse_unordered_selects is turned on. Ticket a306e56ff68b8fa5 ・Fix a bug in the code generator that can causes incorrect results if two or more virtual tables are joined and the virtual table used in outer loop of the join has an IN operator constraint. ・Correctly interpret negative "PRAGMA cache_size" values when determining the cache size used for sorting large amounts of data.
・Improved support for using the STDCALL calling convention in winsqlite3.dll. ・Fix the sqlite3_trace_v2() interface so that it is disabled if either the callback or the mask arguments are zero, in accordance with the documentation. ・Fix commenting errors and improve the comments generated on EXPLAIN listings when the -DSQLITE_ENABLE_EXPLAIN_COMMENTS compile-time option is used. ・Fix the ".read" command in the command-line shell so that it understands that its input is not interactive. Correct affinity computations for a SELECT on the RHS of an IN operator. Fix for ticket 199df4168c. ・The ORDER BY LIMIT optimization is not valid unless the inner-most IN operator loop is actually used by the query plan. ・Fix an internal code generator problem that was causing some DELETE operations to no-op.
[推定] 連続した場合には早いので、EXCLUSIVEロック待ちだと推定している。 ただしリクエストはほぼ全部シーケンシャルなので、本来はロック待ち自体がおかしい。 なお以下仕様のため、sqlite_masterの合成に時間がかかっているのか？とも思い、 全部mainをつけてみたが変化なし。（連続した場合に早いのでこの線もおかしいが） > If the name of the table is unique across all attached databases and the main and temp databases, then the schema-name prefix is not required. > http://www.sqlite.org/lang_attach.html