80 lines
2.5 KiB
Markdown
80 lines
2.5 KiB
Markdown
---
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{
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"title": "yearweek",
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"language": "en"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# yearweek
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## Description
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### Syntax
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`INT YEARWEEK(DATE date)`
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`INT YEARWEEK(DATE date, INT mode)`
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Returns year and week for a date.The value of the mode argument defaults to 0.
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When the week of the date belongs to the previous year, the year and week of the previous year are returned;
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when the week of the date belongs to the next year, the year of the next year is returned and the week is 1.
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The following table describes how the mode argument works.
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|Mode |First day of week |Range |Week 1 is the first week … |
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|:----|:-----------------|:-------|:-----------------------------|
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|0 |Sunday |1-53 |with a Sunday in this year |
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|1 |Monday |1-53 |with 4 or more days this year |
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|2 |Sunday |1-53 |with a Sunday in this year |
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|3 |Monday |1-53 |with 4 or more days this year |
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|4 |Sunday |1-53 |with 4 or more days this year |
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|5 |Monday |1-53 |with a Monday in this year |
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|6 |Sunday |1-53 |with 4 or more days this year |
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|7 |Monday |1-53 |with a Monday in this year |
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The parameter is Date or Datetime type
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## example
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```
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mysql> select yearweek('2021-1-1');
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+----------------------+
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| yearweek('2021-1-1') |
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+----------------------+
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| 202052 |
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+----------------------+
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```
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```
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mysql> select yearweek('2020-7-1');
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+----------------------+
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| yearweek('2020-7-1') |
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+----------------------+
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| 202026 |
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+----------------------+
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```
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```
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mysql> select yearweek('2024-12-30',1);
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+------------------------------------+
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| yearweek('2024-12-30 00:00:00', 1) |
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+------------------------------------+
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| 202501 |
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+------------------------------------+
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```
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## keyword
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YEARWEEK
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