The logic of nulls in databases has been subject of investigation since their introduction in Codd’s Relational Model, which is the foundation of the SQL standard. In the logic based approaches to modelling relational databases proposed so far, nulls are considered as representing unknown values. Such existential semantics fails to capture the behaviour of the SQL standard. We show that, accord...

The translation of natural language questions to SQL queries has attracted growing attention, in particular connection with transformers and similar models. A large number techniques are geared towards the English language; this work, we thus investigated when input given Portuguese language. To do so, properly adapted state-of-the-art tools resources. We changed RAT-SQL+GAP system by relying o...

Most recently, there has been significant interest in learning contextual representations for various NLP tasks, by leveraging large scale text corpora to train powerful language models with self-supervised objectives, such as Masked Language Model (MLM). Based on a pilot study, we observe three issues of existing general-purpose when they are applied the text-to-SQL semantic parsers: fail dete...

In this paper we present a detailed review on various types of SQL injection attacks and prevention technique for web application. Here we are presenting our findings from deep survey on SQL injection attack. This paper is consist of following five section:[1] Introduction, [2]Types of Sql Injection, [3] Related work, [4] Conclusion, And [5] References. Keywords— SQL injection, database securit...

The standard quantum limit (SQL) of a classical mechanical force detection results from back action perturbing evolution system. In this paper we show that usage multidimensional optical transducer may enable broadband evading measurement. We study theoretically corresponding technique measurement resonant signal acting on linear oscillator coupled to generic system with three modes separation ...

For many years now, the SQL standard has been maintained and enhanced by NCITS Technical Committee H2 on Database in the US and by the ISO/IEC JTC 1/SC32/WG3 Database Languages Working Group internationally. After the publication of SQL:1992, the groups began to publish SQL as a base document (SQL/Foundation) and a number of independent parts. These parts began with SQL/CLI (Call-Level Interfac...

Exporting XML views of relational data gives rise to the problem of translating XML queries into SQL. To date, the focus of most of the work in the published literature [9, 14, 20] has been on mechanisms for correctly translating complex XML queries into SQL queries, with less emphasis on evaluating the quality of the resulting SQL queries. The efficiency of the SQL queries generated by the tra...