More on keys and constraints

Ebook "Database design - From novice to professional" includes content: What can go wrong; guided tour of the development process; initial requirements and use cases; learning from the data model, developing a data model, generalization and specialization, from data model to relational schema; normalization; more on keys and constraints, queries, user interface, other implementations,...and other contents.

267p haojiubujain07 20-09-2023 5 3   Download

Plastid gene loss and pseudogenization has been widely documented in parasitic and mycoheterotrophic plants, which have relaxed selective constraints on photosynthetic function. More enigmatic are sporadic reports of pseudogenization and loss of important photosynthesis genes in lineages thought to be fully photosynthetic.

11p vijichea2711 28-05-2021 10 1   Download

Drought is an important constraint on grapevine sustainability. Vitis riparia, widely used in rootstock and scion breeding, has been studied in isolated leaf drying response studies; however, it is essential to identify key root and shoot water deficit signaling traits in intact plants.

20p viharuno2711 24-04-2020 7 0   Download

The basic objective of soil testing programme is to give farmers a service leading to better and more economic use of fertilizers and soil management practices for increasing agricultural production. Now a day’s consumption of fertilizer by farmer is higher than actual requirement. The farmers do not follow the soil testing technique.

5p chauchaungayxua3 07-02-2020 14 0   Download

In this paper, we propose an interpretation of these events in which the prospect of a New Economy plays a key role in generating the other events. More specifically, we show that the mere prospect of high future productiv- ity growth can generate sizable gains in current productivity, as well as an economic expansion, a stock market boom and a financing boom for new firms. There are two main ingredients to our story: financing constraints due to limited contract enforceability and firm-level diminishing returns to scale.

0p bocapchetnguoi 06-12-2012 40 2   Download