帮我解释一下这条sql语句的意思select month01.pk_deptdoc as dept,month01.amot as month01,month02.amot as month02from(select h.pk_deptdoc,sum(expense_amot) as amot from te_expense_b b left join te_expense h on b.pk_expense=h.pk_expensewhere

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帮我解释一下这条sql语句的意思select month01.pk_deptdoc as dept,month01.amot as month01,month02.amot as month02from(select h.pk_deptdoc,sum(expense_amot) as amot from te_expense_b b left join te_expense h on b.pk_expense=h.pk_expensewhere
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帮我解释一下这条sql语句的意思select month01.pk_deptdoc as dept,month01.amot as month01,month02.amot as month02from(select h.pk_deptdoc,sum(expense_amot) as amot from te_expense_b b left join te_expense h on b.pk_expense=h.pk_expensewhere
帮我解释一下这条sql语句的意思
select month01.pk_deptdoc as dept,month01.amot as month01,month02.amot as month02
from
(select h.pk_deptdoc,sum(expense_amot) as amot from te_expense_b b left join te_expense h on b.pk_expense=h.pk_expense
where h.dbilldate>='2013-01-01' and h.dbilldate='2013-02-01' and h.dbilldate

帮我解释一下这条sql语句的意思select month01.pk_deptdoc as dept,month01.amot as month01,month02.amot as month02from(select h.pk_deptdoc,sum(expense_amot) as amot from te_expense_b b left join te_expense h on b.pk_expense=h.pk_expensewhere
这个语句就是一个查询里面嵌套查询的语句,month01,month02作为子查先查询出结果再进行连接进行查询.

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