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我努力理解的问题是:SQL查询字母缩写
编写一个查询,列出成分的开始与初始字母字符数。你的输出应该有< = 26行并按字母顺序排列。
任何帮助将不胜感激!
CREATE TABLE Ingredient
(
idI NUMBER constraint pk_Ingredient PRIMARY KEY ,
ingrDesc VARCHAR2(100) constraint nn1Ingredient not null
);
CREATE TABLE Recipe
(
idR NUMBER constraint pk_recipe PRIMARY KEY ,
recipeTitle VARCHAR2(200) constraint nn1Recipe not null,
prep Text VARCHAR2(4000),
cuisineType VARCHAR2(50),
mealType VARCHAR2(30) DEFAULT NULL,
CONSTRAINT ch_mealType CHECK (mealType IN ('starter', 'main', 'dessert', null))
);
CREATE TABLE RecpIngr
(
idR NUMBER ,
hidI NUMBER ,
CONSTRAINT pk_RecpIngr PRIMARY KEY (idR, idI),
CONSTRAINT fk1RecpIngr_recipe foreign key(idR) references Recipe,
CONSTRAINT fk2RecpIngr_ingredient foreign key(idI) references Ingredient
)
organization index;
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