A FLWOR expression is much like a SELECT-FROM-WHERE expression in SQL: it is used to iterate through a list of items and to optionally return something that is computed from each item.
FLWOR表达式非常像SQL中的SELECT - FROM - WHERE表达式——它用于对由多项组成的一个列表进行迭代，并且可以选择返回通过在每一项上进行计算得到的值。
Like most SQL statements, this example follows the standard SQL syntax of SELECT column (s)... FROM table (s)... WHERE condition (s).
跟大多数sql语句一样，本例遵循SELECTcolumn (s) .FROMtable (s)。
Like most SQL statements, this example follows the standard SQL syntax of SELECT column (s)... FROM table (s)... WHERE condition (s).
跟大多数sql语句一样，本例遵循SELECTcolumn (s) .FROMtable (s)。
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