From a8e2ab5304800ac0a45e3dcc8146042775a6cc25 Mon Sep 17 00:00:00 2001 From: dapan1121 Date: Fri, 5 Nov 2021 19:06:38 +0800 Subject: [PATCH] modify filter document --- documentation20/cn/12.taos-sql/docs.md | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/documentation20/cn/12.taos-sql/docs.md b/documentation20/cn/12.taos-sql/docs.md index 64020208ab..4ba496d575 100644 --- a/documentation20/cn/12.taos-sql/docs.md +++ b/documentation20/cn/12.taos-sql/docs.md @@ -729,17 +729,17 @@ Query OK, 1 row(s) in set (0.001091s) | **Operation** | **Note** | **Applicable Data Types** | | ------------- | ------------------------ | ----------------------------------------- | -| > | larger than | **`timestamp`** and all numeric types | -| < | smaller than | **`timestamp`** and all numeric types | -| >= | larger than or equal to | **`timestamp`** and all numeric types | -| <= | smaller than or equal to | **`timestamp`** and all numeric types | +| > | larger than | all types except bool | +| < | smaller than | all types except bool | +| >= | larger than or equal to | all types except bool | +| <= | smaller than or equal to | all types except bool | | = | equal to | all types | | <> | not equal to | all types | | is [not] null | is null or is not null | all types | -| between and | within a certain range | **`timestamp`** and all numeric types | +| between and | within a certain range | all types except bool | | in | match any value in a set | all types except first column `timestamp` | | like | match a wildcard string | **`binary`** **`nchar`** | -| match/nmatch | filter regex | **regex** | +| match/nmatch | filter regex | **`binary`** **`nchar`** | 1. <> 算子也可以写为 != ，请注意，这个算子不能用于数据表第一列的 timestamp 字段。 2. like 算子使用通配符字符串进行匹配检查。 @@ -766,15 +766,10 @@ Query OK, 1 row(s) in set (0.001091s) **使用限制** - 只能针对表名（即 tbname 筛选）和标签的名称和binary类型标签值 进行正则表达式过滤，不支持针对普通列使用正则表达式过滤。 - - 只能在 WHERE 子句中作为过滤条件存在。 + 只能针对表名（即 tbname 筛选）、binary/nchar类型标签值进行正则表达式过滤，不支持普通列的过滤。 正则匹配字符串长度不能超过 128 字节。可以通过参数 *maxRegexStringLen* 设置和调整最大允许的正则匹配字符串，该参数是客户端配置参数，需要重启才能生效。 - **嵌套查询支持** - - 可以在内层查询和外层查询中使用。 ### JOIN 子句 -- GitLab