How to create a table in SQL? SQL provides an organized way for table creation. Syntax: Create table TableName (columnName1 datatype, columnName2 datatype ) The following is an example of creating a ...

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6 columns : date, customerid, product_quantity, sales, region, transaction_id. Which customer id bought maximum products? Tablename is questions. (hint : get sales by multiplying product_quantity and ...

和char、varchar比较起来，nchar、nvarchar最多存储4000个字符，不论是英文还是汉字；而char、varchar最多能存储8000个英文，4000个汉字。 可以看出使用nchar、nvarchar数据类型时不用担心输入的字符是英文还是汉字，较为方便，但在存储英文时数量上有些损失。