range类型被使用当索引比较使用运算符=,<>,>,>=,<,<=,is null, <=>,between and, like, in等操作符。 mysql>explainselect*fromdept_managerwhereemp_nobetween111877and111890;+---+---+---+---+---+---+---+---+---+---+---+---+|id|select_type|table|partitions|type|possible_keys...
For each row combination in the preceding tables, MySQL checks whether it is possible to use a range or index_merge access method to retrieve rows. This is not very fast, but is faster than performing a join with no index at all. The applicability criteria are as described in Section 8.2...
The applicability criteria are as described in Section 10.2.1.2, “Range Optimization”, and Section 10.2.1.3, “Index Merge Optimization”, with the exception that all column values for the preceding table are known and considered to be constants. Indexes are numbered beginning with 1, in the...
MySQL checks whether it is possible to use a range orindex_merge access method to retrieve rows. This is not very fast, but isfaster than performing a join with no index at all. The applicability
Briefly explain a procedure to recover pure benzoic acid. Is salt dissolving in water a spontaneous process? Explain. What are some examples of situations where recrystallization would not be suitable to purify an organic compound? Explain the remedy for water hardening....
Explain how to find a price, when the demand function and price elasticity of a demand was given. Explain the concept of Price Elasticity of Demand. Explain using suitable examples the various determinants of Price Elasticity of Demand. How do you calculate the elasticity of demand between pr...
Other models keep the number of tokens in a similar range (from 30k to 100k).At every iteration of this algorithm, a new token that is a concatenation of two previous ones will be added to the dictionary. Ultimately, we will end up with 50256 tokens. Add a fixed-number token for "...
Across the stable density stratification of the abyssal ocean, deep dense water is slowly propelled upward by sustained, though irregular, turbulent mixing. The resulting mean upwelling determines large-scale oceanic circulation properties like heat and
, located at ~1100 km distance, filtered in the frequency range 0.02-0.1 Hz. The normalised velocity data are compared for two earthquakes of moment magnitude Mw 5.7 and 6.056(Fig.1aand Suppl. Figures1–2). Fig. 1: Examples of anti-repeaters....
Explain direct and indirect costs are, and provide three examples of each. Difference Between Direct and Indirect Costs: In economics, costs are the amount paid or alternative foregone for choosing a particular good, service, or activity. In production, costs are incurred by firms, ...