C++20 ❤ SQL John R Bandela, MDOverview u SQL u C++ Example u Implementation techniques u fixed_string u meta_struct u Parsing compile time strings into meta_structsOverview v SQL v C++ Example {price_from_user};Avoiding SQL Injection Attacks SELECT orders.id, name, item, price, discount_code FROM orders JOIN customers ON customers.id = customerid WHERE price > ?;SQL Library Options u Traditional Lots of information available u Vulnerable to sql injection of developer not careful u Use dynamic typingDomain Specific Language u Use types to encode SQL u Looks more like regular C++ u Typically requires

Firebird Null Guide NULL behaviour and pitfalls in Firebird SQL Paul Vinkenoog Version 1.2, 30 June 2020 Table of Contents 1. What is NULL? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. NULL support in Firebird SQL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operations will render the entire expression NULL. This guide explores the behaviour of NULL in Firebird SQL, points out common pitfalls and shows you how to deal safely with expressions that contain NULL or

TiDB: HBase分布式事务与SQL实现 About me ● TiDB & Codis founder ● Golang expert ● Distributed database developer ● Currentlly, CEO and co-founder of PingCAP liuqi@pingcap.com https://github.com/pingcap/tidb say ? “Nothing is hotter than SQL-on-Hadoop, and now SQL-on- HBase is fast approaching equal hotness status” Form HBaseCon 2015 We want more ! SQL + Transaction(ACID) TiDB Features Let’s talk about SQL How does TiDB map SQL to KV User table RowID(hidden column) name email 1 bob bob@gmail.com Inside TiDB，each table, column has an unique ID How to map SQL to KV Let assume

第三届中国Rust开发者⼤会 ⽤ egg 孵化你的 SQL 优化器 王润基 RisingWave 内核开发⼯程师 ? Parser Binder Optimizer Executor SQL AST Logical Plan Physical Plan Table Catalog Storage RisingLight 查询引擎的整体结构 SELECT name, url url FROM t1 JOIN t2 WHERE t1.id = t2.id AND name = ‘Bob’ SQL Logical Plan Physical Plan Projection name, url Filter t1.id = t2.id name = “Bob” Join Scan t1(id, name) Scan t2(id, url) Filter #1 = “Bob” Hash Join #0 = #2 Scan $1.1, $1.2 Scan $2.1, $2.2 Projection #1, #3 ⼀个 SQL 语句优化的例⼦ 基于规则的优化 (RBO) 基于代价的优化 (CBO) 谓词下推 Join Filter A B Join Filter A B Filter Join A Join

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'dbListResults_SQLiteConnection.R' 'dbListTables_SQLiteConnection.R' 'dbQuoteIdentifier_SQLiteConnection_SQL.R' 'dbQuoteIdentifier_SQLiteConnection_character.R' 'dbReadTable_SQLiteConnection_character.R' 'db 'dbSendQuery_SQLiteConnection_character.R' 'dbUnloadDriver_SQLiteDriver.R' 'dbUnquoteIdentifier_SQLiteConnection_SQL.R' 'dbWriteTable_SQLiteConnection_character_character.R' 'dbWriteTable_SQLiteConnection_character_data Needed for compatibility with generic. Otherwise ignored. field.types character vector of named SQL field types where the names are the names of new table’s columns. If missing, types inferred with DBI::dbDataType())

implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public secure_delete Pragma ............................................................................. 80 sql_trace Pragma ..................................................................................... SQLite Injection .................................................................... 120 Preventing SQL Injection: ....................................................................... 120 SQLite Explain