LAG
适用于 ✅ 开源版 ✅ 专业版 ✅ 企业版
LAG 窗口函数允许获取在前一行或第 n 行之前评估的表达式的值（如果给定了偏移量）。
SELECT ID, lag(ID) OVER (ORDER BY ID), lag(ID, 2) OVER (ORDER BY ID), lag(ID, 2, -1) OVER (ORDER BY ID) FROM BOOK;
create.select(
BOOK.ID,
lag(BOOK.ID).over(orderBy(BOOK.ID)),
lag(BOOK.ID, 2).over(orderBy(BOOK.ID)),
lag(BOOK.ID, 2, -1).over(orderBy(BOOK.ID)))
.from(BOOK)
.fetch();
产生
+----+------+------+------+ | id | lag | lag | lag | +----+------+------+------+ | 1 | | | -1 | | 2 | 1 | | -1 | | 3 | 2 | 1 | 1 | | 4 | 3 | 2 | 2 | +----+------+------+------+
lag(BOOK.ID).over(orderBy(BOOK.ID))
翻译成以下特定方言的表达式
Aurora Postgres, BigQuery, CockroachDB, DB2, Databricks, DuckDB, Exasol, Firebird, H2, Hana, Informix, MariaDB, MemSQL, MySQL, Oracle, Postgres, Redshift, SQLDataWarehouse, SQLServer, SQLite, Snowflake, Teradata, Trino, Vertica, YugabyteDB
lag(BOOK.ID) OVER (ORDER BY BOOK.ID)
ClickHouse
lagInFrame(BOOK.ID) OVER ( ORDER BY BOOK.ID RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING )
ASE, Access, Aurora MySQL, Derby, HSQLDB, Sybase
/* UNSUPPORTED */
使用 jOOQ 3.21 生成。早期 jOOQ 版本的支持可能有所不同。 在我们的网站上翻译您自己的 SQL
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